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[ASA-202011-23] matrix-synapse: denial of service
by Morten Linderud 05 Dec '20

05 Dec '20

Arch Linux Security Advisory ASA-202011-23 ========================================== Severity: High Date : 2020-11-26 CVE-ID : CVE-2020-26890 Package : matrix-synapse Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1296 Summary ======= The package matrix-synapse before version 1.20.1-1 is vulnerable to denial of service. Resolution ========== Upgrade to 1.20.1-1. # pacman -Syu "matrix-synapse>=1.20.1-1" The problem has been fixed upstream in version 1.20.1. Workaround ========== None. Description =========== Matrix Synapse before 1.20.0 erroneously permits non-standard NaN, Infinity, and -Infinity JSON values in fields of m.room.member events, allowing remote attackers to execute a denial of service attack against the federation and common Matrix clients. If such a malformed event is accepted into the room's state, the impact is long-lasting and is not fixed by an upgrade to a newer version, requiring the event to be manually redacted instead. Since events are replicated to servers of other room members, the impact is not constrained to the server of the event sender. Impact ====== A remote attacker might be able to cause a denial of service via a crafted event. References ========== https://github.com/matrix-org/synapse/security/advisories/GHSA-4mp3-385r-v6… https://github.com/matrix-org/synapse/pull/8106 https://github.com/matrix-org/synapse/pull/8106/commits/c88c15b5fcf26940515… https://github.com/matrix-org/synapse/pull/8106/commits/248d8284fa850289689… https://github.com/matrix-org/synapse/pull/8106/commits/5516ae216d8cfe34b04… https://github.com/matrix-org/synapse/pull/8291 https://github.com/matrix-org/synapse/pull/8291/commits/1cad688bda57dcc8f9c… https://github.com/matrix-org/synapse/pull/8291/commits/4d654058dec5a77e2d1… https://security.archlinux.org/CVE-2020-26890

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[ASA-202011-22] ceph: multiple issues
by Morten Linderud 05 Dec '20

05 Dec '20

Arch Linux Security Advisory ASA-202011-22 ========================================== Severity: High Date : 2020-11-26 CVE-ID : CVE-2020-1759 CVE-2020-1760 CVE-2020-10753 CVE-2020-25660 Package : ceph Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1195 Summary ======= The package ceph before version 15.2.6-1 is vulnerable to multiple issues including authentication bypass, content spoofing, cross-site scripting and private key recovery. Resolution ========== Upgrade to 15.2.6-1. # pacman -Syu "ceph>=15.2.6-1" The problems have been fixed upstream in version 15.2.6. Workaround ========== None. Description =========== - CVE-2020-1759 (private key recovery) A vulnerability was found in Red Hat Ceph Storage 4 and Red Hat Openshift Container Storage 4.2, where a nonce reuse vulnerability was discovered in the secure mode of the messenger v2 protocol, which can allow an attacker to forge auth tags and potentially manipulate the data by leveraging the reuse of a nonce in a session. Messages encrypted using a reused nonce value are susceptible to serious confidentiality and integrity attacks. - CVE-2020-1760 (cross-site scripting) A flaw was found in the Ceph Object Gateway, where it supports request sent by an anonymous user in Amazon S3. This flaw could lead to potential XSS attacks due to the lack of proper neutralization of untrusted input. If the attacker knows the path to a publicly readable object on any RGW cluster and the object is at least large enough to cover the attack body then it is possible to run an XSS on any object. - CVE-2020-10753 (content spoofing) A flaw was found in the Ceph Storage RadosGW (Ceph Object Gateway). The vulnerability is related to the injection of HTTP headers via a CORS ExposeHeader tag. The newline character in the ExposeHeader tag in the CORS configuration file generates a header injection in the response when the CORS request is made. This issue affects the RadosGW S3 API, it does not affect the Swift API. - CVE-2020-25660 (authentication bypass) A flaw was found in the Cephx authentication protocol in versions before 15.2.6 and before 14.2.14, where it does not verify Ceph clients correctly and is then vulnerable to replay attacks in Nautilus. This flaw allows an attacker with access to the Ceph cluster network to authenticate with the Ceph service via a packet sniffer and perform actions allowed by the Ceph service. This issue is a reintroduction of CVE-2018-1128, affecting the msgr2 protocol. The msgr2 protocol is used for all communication except older clients that do not support the msgr2 protocol. The msgr1 protocol is not affected. The highest threat from this vulnerability is to confidentiality, integrity, and system availability. Impact ====== An attacker might be able to decrypt and force Ceph messages, bypass CORS and exploit XSS to trick a user into performing an unwanted action. References ========== https://bugs.archlinux.org/task/67047 https://docs.ceph.com/en/latest/releases/octopus/#v15-2-1-octopus https://docs.ceph.com/en/latest/releases/nautilus/#v14-2-9-nautilus https://www.openwall.com/lists/oss-security/2020/04/07/2 https://github.com/ceph/ceph/pull/34482 https://github.com/ceph/ceph/commit/47c7e623546a7a33bd6bbddfb899fa9c9a40f40a https://github.com/ceph/ceph/commit/f6c5ad8a5f534d73cba9c6bd794a89e879c46ecc https://www.openwall.com/lists/oss-security/2020/04/07/1 https://github.com/ceph/ceph/commit/fce0b267446d6f3f631bb4680ebc3527bbbea002 https://github.com/ceph/ceph/commit/87a63d1743ec6428b43cc5a5977fa5e90f50b7ed https://github.com/ceph/ceph/commit/c7da604cb101cbe78a257a29498a98c69964e0a6 https://docs.ceph.com/en/latest/releases/nautilus/#v14-2-10-nautilus https://docs.ceph.com/en/latest/releases/octopus/#v15-2-4-octopus https://github.com/ceph/ceph/pull/35773 https://github.com/ceph/ceph/commit/ea0a33719e1765a79eb0c7137262b8e93cd073e3 https://ceph.io/community/v15-2-6-octopus-released/ https://ceph.io/releases/v14-2-14-nautilus-released/ https://github.com/ceph/ceph/commit/4a82c72e3bdddcb625933e83af8b50a444b961f1 https://github.com/ceph/ceph/commit/6f5c4152ca2c6423e665cde2196c6301f76043a2 https://github.com/ceph/ceph/commit/949e2e595eda553aa68f697cee1dcfff3c09cf3f https://security.archlinux.org/CVE-2020-1759 https://security.archlinux.org/CVE-2020-1760 https://security.archlinux.org/CVE-2020-10753 https://security.archlinux.org/CVE-2020-25660

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[ASA-202011-21] swtpm: privilege escalation
by Morten Linderud 29 Nov '20

29 Nov '20

Arch Linux Security Advisory ASA-202011-21 ========================================== Severity: Medium Date : 2020-11-19 CVE-ID : CVE-2020-28407 Package : swtpm Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-1282 Summary ======= The package swtpm before version 0.5.1-1 is vulnerable to privilege escalation. Resolution ========== Upgrade to 0.5.1-1. # pacman -Syu "swtpm>=0.5.1-1" The problem has been fixed upstream in version 0.5.1. Workaround ========== None. Description =========== A potential symbolic link following issue has been found in swtpm before 0.5.1. Impact ====== A malicious file might trick the program to overwrite files and escalate priviledges. References ========== https://github.com/stefanberger/swtpm/compare/v0.5.0...v0.5.1 https://github.com/stefanberger/swtpm/commit/e9c9778d5c35ef077aed1ec6601b47… https://github.com/stefanberger/swtpm/commit/4cc42c0ba3632a98ef381bda68d0a4… https://github.com/stefanberger/swtpm/commit/634b6294000fb785b9f12e13b852c1… https://github.com/stefanberger/swtpm/commit/a03cbadd087b2602412823f254ac75… https://github.com/stefanberger/swtpm/commit/526300236dc8a7664acdc265b6fc5d… https://github.com/stefanberger/swtpm/commit/e621b21d4c31029ebe794350fcff2b… https://security.archlinux.org/CVE-2020-28407

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[ASA-202011-20] raptor: arbitrary code execution
by Morten Linderud 29 Nov '20

29 Nov '20

Arch Linux Security Advisory ASA-202011-20 ========================================== Severity: Medium Date : 2020-11-19 CVE-ID : CVE-2017-18926 CVE-2020-25713 Package : raptor Type : arbitrary code execution Remote : No Link : https://security.archlinux.org/AVG-1283 Summary ======= The package raptor before version 2.0.15-14 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 2.0.15-14. # pacman -Syu "raptor>=2.0.15-14" The problems have been fixed upstream but no release is available yet. Workaround ========== None. Description =========== - CVE-2017-18926 (arbitrary code execution) raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maximum nspace declarations for the XML writer, leading to heap-based buffer overflows (sometimes seen in raptor_qname_format_as_xml). - CVE-2020-25713 (arbitrary code execution) A malformed input file can lead to a segfault due to an out of bounds array access in raptor_xml_writer_start_element_common. Impact ====== A maliciously crafted RDF file can crash the application or execute arbitrary code. References ========== https://bugs.archlinux.org/task/68613 https://www.openwall.com/lists/oss-security/2017/06/07/1 http://bugs.librdf.org/mantis/view.php?id=617 http://bugs.librdf.org/mantis/view.php?id=618 https://github.com/dajobe/raptor/commit/590681e546cd9aa18d57dc2ea1858cb734a… https://bugs.librdf.org/mantis/view.php?id=650 https://bugs.librdf.org/mantis/file_download.php?file_id=348&type=bug https://security.archlinux.org/CVE-2017-18926 https://security.archlinux.org/CVE-2020-25713

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[ASA-202011-19] libass: arbitrary code execution
by Morten Linderud 29 Nov '20

29 Nov '20

Arch Linux Security Advisory ASA-202011-19 ========================================== Severity: Medium Date : 2020-11-19 CVE-ID : CVE-2020-26682 Package : libass Type : arbitrary code execution Remote : No Link : https://security.archlinux.org/AVG-1285 Summary ======= The package libass before version 0.15.0-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 0.15.0-1. # pacman -Syu "libass>=0.15.0-1" The problem has been fixed upstream in version 0.15.0. Workaround ========== None. Description =========== In libass 0.14.0, the ass_outline_construct's call to outline_stroke causes a signed integer overflow. Impact ====== A maliciously crafted file might crash the application or execute arbitrary code. References ========== https://github.com/libass/libass/issues/431 https://github.com/libass/libass/pull/432 https://github.com/libass/libass/commit/676f9dc5b52ef406c5527bdadbcb947f113… https://security.archlinux.org/CVE-2020-26682

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[ASA-202011-18] c-ares: denial of service
by Morten Linderud 29 Nov '20

29 Nov '20

Arch Linux Security Advisory ASA-202011-18 ========================================== Severity: Medium Date : 2020-11-19 CVE-ID : CVE-2020-8277 Package : c-ares Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1280 Summary ======= The package c-ares before version 1.17.1-1 is vulnerable to denial of service. Resolution ========== Upgrade to 1.17.1-1. # pacman -Syu "c-ares>=1.17.1-1" The problem has been fixed upstream in version 1.17.1. Workaround ========== None. Description =========== An application that allows an attacker to trigger a DNS request for a host of their choice could trigger a Denial of Service by getting the application to resolve a DNS record with a large number of responses. Impact ====== A remote malicious attacker might be able to crash the application with a crafted DNS response. References ========== https://github.com/c-ares/c-ares/issues/371 https://github.com/c-ares/c-ares/commit/0d252eb3b2147179296a3bdb4ef97883c97… https://security.archlinux.org/CVE-2020-8277

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[ASA-202011-17] rclone: private key recovery
by Morten Linderud 29 Nov '20

29 Nov '20

Arch Linux Security Advisory ASA-202011-17 ========================================== Severity: Medium Date : 2020-11-19 CVE-ID : CVE-2020-28924 Package : rclone Type : private key recovery Remote : No Link : https://security.archlinux.org/AVG-1286 Summary ======= The package rclone before version 1.53.3-1 is vulnerable to private key recovery. Resolution ========== Upgrade to 1.53.3-1. # pacman -Syu "rclone>=1.53.3-1" The problem has been fixed upstream in version 1.53.3. Workaround ========== All passwords generated by rclone 1.49.0 up to 1.53.2 should be changed. Rclone provides a password checker to find weak passwords as a separate tool called passwordcheck. Description =========== An issue was discovered in rclone 1.49.0 up to 1.53.2. Due to the use of a weak random number generator, the password generator has been producing weak passwords with much less entropy than advertised. The suggested passwords depend deterministically on the time rclone was started. This limits the entropy of the passwords enormously. These passwords are often used in the crypt backend for encryption of data. It would be possible to make a dictionary of all possible passwords with about 38 million entries per password length. This would make decryption of secret material possible with a plausible amount of effort. NOTE: all passwords generated by affected versions should be changed. Impact ====== A malicious user might be able to brute force the weak passwords. References ========== https://github.com/rclone/rclone/issues/4783 https://github.com/rclone/rclone/commit/7985df37681f54d013816a4641da4f9b085… https://github.com/rclone/passwordcheck https://security.archlinux.org/CVE-2020-28924

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[ASA-202011-16] go: multiple issues
by Morten Linderud 26 Nov '20

26 Nov '20

Arch Linux Security Advisory ASA-202011-16 ========================================== Severity: High Date : 2020-11-17 CVE-ID : CVE-2020-28362 CVE-2020-28366 CVE-2020-28367 Package : go Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1278 Summary ======= The package go before version 2:1.15.5-1 is vulnerable to multiple issues including arbitrary code execution and denial of service. Resolution ========== Upgrade to 2:1.15.5-1. # pacman -Syu "go>=2:1.15.5-1" The problems have been fixed upstream in version 1.15.5. Workaround ========== None. Description =========== - CVE-2020-28362 (denial of service) A flaw was found in go before 1.15.5 where a number of math/big.Int methods (Div, Exp, DivMod, Quo, Rem, QuoRem, Mod, ModInverse, ModSqrt, Jacobi, and GCD) can panic when provided crafted large inputs. For the panic to happen, the divisor or modulo argument must be larger than 3168 bits (on 32-bit architectures) or 6336 bits (on 64-bit architectures). Multiple math/big.Rat methods are similarly affected. crypto/rsa.VerifyPSS, crypto/rsa.VerifyPKCS1v15, and crypto/dsa.Verify may panic when provided crafted public keys and signatures. crypto/ecdsa and crypto/elliptic operations may only be affected if custom CurveParams with unusually large field sizes (several times larger than the largest supported curve, P-521) are in use. Using crypto/x509.Verify on a crafted X.509 certificate chain can lead to a panic, even if the certificates don’t chain to a trusted root. The chain can be delivered via a crypto/tls connection to a client, or to a server that accepts and verifies client certificates. net/http clients can be made to crash by an HTTPS server, while net/http servers that accept client certificates will recover the panic and are unaffected. Moreover, an application might crash invoking crypto/x509.(*CertificateRequest).CheckSignature on an X.509 certificate request or during a golang.org/x/crypto/otr conversation. Parsing a golang.org/x/crypto/openpgp Entity or verifying a signature may crash. Finally, a golang.org/x/crypto/ssh client can panic due to a malformed host key, while a server could panic if either PublicKeyCallback accepts a malformed public key, or if IsUserAuthority accepts a certificate with a malformed public key. - CVE-2020-28366 (arbitrary code execution) A flaw was found in go beforer 1.15.5 where the go command may execute arbitrary code at build time when cgo is in use. This may occur when running go get on a malicious package, or any other command that builds untrusted code. - CVE-2020-28367 (arbitrary code execution) A flaw was found in go before 1.15.5 where the go command may execute arbitrary code at build time when cgo is in use. This may occur when running go get on a malicious package, or any other command that builds untrusted code. Impact ====== A local attacker might be able to crash the program via a crafted input. In addition a remote attacker might be able to execute arbitrary code when go get is run on a malicious package, or untrusted code is built via any other command. References ========== https://github.com/golang/go/commit/84150d0af193a7ccd733b3c7fa5787f43125cd2d https://github.com/golang/go/issues/42554 https://github.com/golang/go/issues/42562 https://github.com/golang/go/commit/32159824698a82a174b60a6845e8494ae3243102 https://github.com/golang/go/issues/42558 https://github.com/golang/go/commit/ec06b6d6be568ce1591d91a0ea4f14c190d06605 https://security.archlinux.org/CVE-2020-28362 https://security.archlinux.org/CVE-2020-28366 https://security.archlinux.org/CVE-2020-28367

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[ASA-202011-15] libxml2: multiple issues
by Morten Linderud 26 Nov '20

26 Nov '20

Arch Linux Security Advisory ASA-202011-15 ========================================== Severity: Medium Date : 2020-11-17 CVE-ID : CVE-2019-20388 CVE-2020-7595 CVE-2020-24977 Package : libxml2 Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1263 Summary ======= The package libxml2 before version 2.9.10-6 is vulnerable to multiple issues including denial of service and information disclosure. Resolution ========== Upgrade to 2.9.10-6. # pacman -Syu "libxml2>=2.9.10-6" The problems have been fixed upstream but no release is available yet. Workaround ========== None. Description =========== - CVE-2019-20388 (denial of service) A memory leak was found in the xmlSchemaValidateStream function of libxml2. Applications that use this library may be vulnerable to memory not being freed leading to a denial of service. - CVE-2020-7595 (denial of service) xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation. - CVE-2020-24977 (information disclosure) GNOME project libxml2 <= 2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c. Impact ====== A remote attacker might be able to crash an application using libxml2 or access sensitive information via a crafted XML payload. References ========== https://bugs.archlinux.org/task/68510 https://gitlab.gnome.org/GNOME/libxml2/commit/7ffcd44d7e6c46704f8af0321d931… https://gitlab.gnome.org/GNOME/libxml2/commit/0e1a49c8907645d2e155f0d89d4d9… https://gitlab.gnome.org/GNOME/libxml2/commit/50f06b3efb638efb0abd95dc62dca… https://security.archlinux.org/CVE-2019-20388 https://security.archlinux.org/CVE-2020-7595 https://security.archlinux.org/CVE-2020-24977

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[ASA-202011-14] postgresql: multiple issues
by Morten Linderud 26 Nov '20

26 Nov '20

Arch Linux Security Advisory ASA-202011-14 ========================================== Severity: High Date : 2020-11-17 CVE-ID : CVE-2020-25694 CVE-2020-25695 CVE-2020-25696 Package : postgresql Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1276 Summary ======= The package postgresql before version 12.5-1 is vulnerable to multiple issues including sandbox escape, arbitrary code execution and silent downgrade. Resolution ========== Upgrade to 12.5-1. # pacman -Syu "postgresql>=12.5-1" The problems have been fixed upstream in version 12.5. Workaround ========== None. Description =========== - CVE-2020-25694 (silent downgrade) A security issue has been found in PostgreSQL before 12.5. Many PostgreSQL-provided client applications have options that create additional database connections. Some of those applications reuse only the basic connection parameters (e.g. host, user, port), dropping others. If this drops a security-relevant parameter (e.g. channel_binding, sslmode, requirepeer, gssencmode), the attacker has an opportunity to complete a MITM attack or observe cleartext transmission. Affected applications are clusterdb, pg_dump, pg_restore, psql, reindexdb, and vacuumdb. The vulnerability arises only if one invokes an affected client application with a connection string containing a security-relevant parameter. - CVE-2020-25695 (sandbox escape) A security issue has been found in PostgreSQL before 12.5, where an attacker having permission to create non-temporary objects in at least one schema can execute arbitrary SQL functions under the identity of a superuser. While promptly updating PostgreSQL is the best remediation for most users, a user unable to do that can work around the vulnerability by disabling autovacuum and not manually running ANALYZE, CLUSTER, REINDEX, CREATE INDEX, VACUUM FULL, REFRESH MATERIALIZED VIEW, or a restore from output of the pg_dump command. Performance may degrade quickly under this workaround. VACUUM without the FULL option is safe, and all commands are fine when a trusted user owns the target object. - CVE-2020-25696 (arbitrary code execution) A security issue has been found in PostgreSQL before 12.5, where psql's \gset allows overwriting specially treated variables. The \gset meta- command, which sets psql variables based on query results, does not distinguish variables that control psql behavior. If an interactive psql session uses \gset when querying a compromised server, the attacker can execute arbitrary code as the operating system account running psql. Using \gset with a prefix not found among specially treated variables, e.g. any lowercase string, precludes the attack in an unpatched psql. Impact ====== An attacker in position of man-in-the-middle might be able to access sensitive information or even alter SQL commands. A remote, authenticated attacker might be able to escape the PG sandbox and execute arbitrary code on the server. References ========== https://www.postgresql.org/about/news/postgresql-131-125-1110-1015-9620-and… https://security.archlinux.org/CVE-2020-25694 https://security.archlinux.org/CVE-2020-25695 https://security.archlinux.org/CVE-2020-25696

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