July 2015 - Arch-security - lists.archlinux.org

[arch-security] [ASA-201507-13] flashplugin: arbitrary code execution
by Levente Polyak 16 Jul '15

16 Jul '15

Arch Linux Security Advisory ASA-201507-13 ========================================== Severity: Critical Date : 2015-07-16 CVE-ID : CVE-2015-5122 CVE-2015-5123 Package : flashplugin Type : arbitrary code execution Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package flashplugin before version 11.2.202.491-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 11.2.202.491-1. # pacman -Syu "flashplugin>=11.2.202.491-1" The problems have been fixed upstream in version 11.2.202.491. Workaround ========== None. Description =========== - CVE-2015-5122 (arbitrary code execution) Use-after-free vulnerability in the DisplayObject class in the ActionScript 3 (AS3) implementation allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted Flash content that leverages improper handling of the opaqueBackground property. - CVE-2015-5123 (arbitrary code execution) Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3) implementation allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted Flash content that overrides a valueOf function. Impact ====== A remote attacker is able to use a specially crafted flash application to execute arbitrary code. References ========== https://helpx.adobe.com/security/products/flash-player/apsb15-18.html https://access.redhat.com/security/cve/CVE-2015-5122 https://access.redhat.com/security/cve/CVE-2015-5123

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[arch-security] [ASA-201507-12] lib32-openssl: man-in-the-middle
by Levente Polyak 13 Jul '15

13 Jul '15

Arch Linux Security Advisory ASA-201507-12 ========================================== Severity: High Date : 2015-07-13 CVE-ID : CVE-2015-1793 Package : lib32-openssl Type : man-in-the-middle Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package lib32-openssl before version 1.0.2.d-1 is vulnerable to man-in-the-middle. Resolution ========== Upgrade to 1.0.2.d-1. # pacman -Syu "lib32-openssl>=1.0.2.d-1" The problem has been fixed upstream in version 1.0.2.d. Workaround ========== None. Description =========== During certificate verification, OpenSSL will attempt to find an alternative certificate chain if the first attempt to build such a chain fails. An error in the implementation of this logic can mean that an attacker could cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and "issue" an invalid certificate. This issue will impact any application that verifies certificates including SSL/TLS/DTLS clients and SSL/TLS/DTLS servers using client authentication. Impact ====== A remote attacker is able to use a valid leaf certificate to act as a CA and "issue" an invalid certificate that behaves valid to possibly perform a man-in-the-middle attack. References ========== https://openssl.org/news/secadv_20150709.txt https://access.redhat.com/security/cve/CVE-2015-1793

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[arch-security] [ASA-201507-11] lib32-krb5: multiple issues
by Levente Polyak 12 Jul '15

12 Jul '15

Arch Linux Security Advisory ASA-201507-11 ========================================== Severity: Medium Date : 2015-07-12 CVE-ID : CVE-2014-5355 CVE-2015-2694 Package : lib32-krb5 Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package lib32-krb5 before version 1.13.2-2 is vulnerable to multiple issues including denial of service and preauthentication requirement bypass. Resolution ========== Upgrade to 1.13.2-2. # pacman -Syu "lib32-krb5>=1.13.2-2" The problems have been fixed upstream in version 1.13.2. Workaround ========== None. Description =========== - CVE-2014-5355 (denial of service) When a server process uses the krb5_recvauth function, an unauthenticated remote attacker can cause a NULL dereference by sending a zero-byte version string, or a read beyond the end of allocated storage by sending a non-null-terminated version string. The example user-to-user server application (uuserver) is similarly vulnerable to a zero-length or non-null-terminated principal name string. The krb5_recvauth function reads two version strings from the client using krb5_read_message(), which produces a krb5_data structure containing a length and a pointer to an octet sequence. krb5_recvaut assumes that the data pointer is a valid C string and passes it to strcmp() to verify the versions. If the client sends an empty octet sequence, the data pointer will be NULL and strcmp() will dereference a NULL pointer, causing the process to crash. If the client sends a non-null-terminated octet sequence, strcmp() will read beyond the end of the allocated storage, possibly causing the process to crash. - CVE-2015-2694 (preauthentication requirement bypass) It has been discovered that, when the KDC is configured with PKINIT support, an unauthenticated remote attacker can bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal's long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user's password. Impact ====== A remote attacker is able to send specially crafted packets to perform a denial of service attack or bypass the requires_preauth flag and obtain ciphertext that could be used to conduct an off-line dictionary attack against the user's password. References ========== https://krbdev.mit.edu/rt/Ticket/Display.html?id=8050 https://krbdev.mit.edu/rt/Ticket/Display.html?id=8160 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-5355 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2694 https://bugs.archlinux.org/task/45575

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[arch-security] [ASA-201507-10] krb5: multiple issues
by Levente Polyak 12 Jul '15

12 Jul '15

Arch Linux Security Advisory ASA-201507-10 ========================================== Severity: Medium Date : 2015-07-12 CVE-ID : CVE-2014-5355 CVE-2015-2694 Package : krb5 Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package krb5 before version 1.13.2-1 is vulnerable to multiple issues including denial of service and preauthentication requirement bypass. Resolution ========== Upgrade to 1.13.2-1. # pacman -Syu "krb5>=1.13.2-1" The problems have been fixed upstream in version 1.13.2. Workaround ========== None. Description =========== - CVE-2014-5355 (denial of service) When a server process uses the krb5_recvauth function, an unauthenticated remote attacker can cause a NULL dereference by sending a zero-byte version string, or a read beyond the end of allocated storage by sending a non-null-terminated version string. The example user-to-user server application (uuserver) is similarly vulnerable to a zero-length or non-null-terminated principal name string. The krb5_recvauth function reads two version strings from the client using krb5_read_message(), which produces a krb5_data structure containing a length and a pointer to an octet sequence. krb5_recvaut assumes that the data pointer is a valid C string and passes it to strcmp() to verify the versions. If the client sends an empty octet sequence, the data pointer will be NULL and strcmp() will dereference a NULL pointer, causing the process to crash. If the client sends a non-null-terminated octet sequence, strcmp() will read beyond the end of the allocated storage, possibly causing the process to crash. - CVE-2015-2694 (preauthentication requirement bypass) It has been discovered that, when the KDC is configured with PKINIT support, an unauthenticated remote attacker can bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal's long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user's password. Impact ====== A remote attacker is able to send specially crafted packets to perform a denial of service attack or bypass the requires_preauth flag and obtain ciphertext that could be used to conduct an off-line dictionary attack against the user's password. References ========== https://krbdev.mit.edu/rt/Ticket/Display.html?id=8050 https://krbdev.mit.edu/rt/Ticket/Display.html?id=8160 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-5355 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2694 https://bugs.archlinux.org/task/45575

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[arch-security] [ASA-201507-9] thunderbird: multiple issues
by Remi Gacogne 11 Jul '15

11 Jul '15

Arch Linux Security Advisory ASA-201507-9 ========================================= Severity: High Date : 2015-07-11 CVE-ID : CVE-2015-2724 CVE-2015-2725 CVE-2015-2726 CVE-2015-2731 CVE-2015-2734 CVE-2015-2735 CVE-2015-2736 CVE-2015-2737 CVE-2015-2738 CVE-2015-2739 CVE-2015-2740 CVE-2015-2741 Package : thunderbird Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package thunderbird before version 38.1.0-1 is vulnerable to multiple issues, including remote code execution and key pinning bypass. Resolution ========== Upgrade to 38.1.0-1. # pacman -Syu "thunderbird>=38.1.0-1" The problem has been fixed upstream in version 38.1.0. Workaround ========== None. Description =========== - CVE-2015-2724, CVE-2015-2725, CVE-2015-2726 (Miscellaneous memory safety hazards): Mozilla developers and community identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code. In general these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled, but are potentially a risk in browser or browser-like contexts. - CVE-2015-2731 (Use-after-free in Content Policy due to microtask execution error): Security researcher Herre reported a use-after-free vulnerability when a Content Policy modifies the Document Object Model to remove a DOM object, which is then used afterwards due to an error in microtask implementation. This leads to an exploitable crash. In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts. - CVE-2015-2734, CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740 (Vulnerabilities found through code inspection): Security researcher Ronald Crane reported seven vulnerabilities affecting released code that he found through code inspection. These included three uses of uninitialized memory, one poor validation leading to an exploitable crash, one read of unowned memory in zip files, and two buffer overflows. These do not all have clear mechanisms to be exploited through web content but are vulnerable if a mechanism can be found to trigger them. - CVE-2015-2741 (Key pinning is ignored when overridable errors are encountered): Mozilla security engineer David Keeler reported that when an overridable error is encountered, such as those for expired certificates or a host name does not match a certificate, pinning checks can be be skipped. This would allow for a user to override a pinned certificate when they should not be able to do so. This issue does not allow for third parties to cause a certificate to be overridden and the user would still have to manually do so. In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts. Impact ====== A remote adversary may be able to execute arbitrary code, or trick user into bypassing key pinning. References ========== https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#t… https://www.mozilla.org/en-US/security/advisories/mfsa2015-59/ https://www.mozilla.org/en-US/security/advisories/mfsa2015-63/ https://www.mozilla.org/en-US/security/advisories/mfsa2015-66/ https://www.mozilla.org/en-US/security/advisories/mfsa2015-67/ https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2724 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2725 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2726 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2731 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2734 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2735 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2736 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2737 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2738 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2739 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2740 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2741

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[arch-security] [ASA-201507-8] openssl: man-in-the-middle
by Levente Polyak 09 Jul '15

09 Jul '15

Arch Linux Security Advisory ASA-201507-8 ========================================= Severity: High Date : 2015-07-09 CVE-ID : CVE-2015-1793 Package : openssl Type : man-in-the-middle Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package openssl before version 1.0.2.d-1 is vulnerable to man-in-the-middle. Resolution ========== Upgrade to 1.0.2.d-1. # pacman -Syu "openssl>=1.0.2.d-1" The problem has been fixed upstream in version 1.0.2.d. Workaround ========== None. Description =========== During certificate verification, OpenSSL will attempt to find an alternative certificate chain if the first attempt to build such a chain fails. An error in the implementation of this logic can mean that an attacker could cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and "issue" an invalid certificate. This issue will impact any application that verifies certificates including SSL/TLS/DTLS clients and SSL/TLS/DTLS servers using client authentication. Impact ====== A remote attacker is able to use a valid leaf certificate to act as a CA and "issue" an invalid certificate that behaves valid to possibly perform a man-in-the-middle attack. References ========== https://openssl.org/news/secadv_20150709.txt https://access.redhat.com/security/cve/CVE-2015-1793

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[arch-security] [ASA-201507-7] flashplugin: remote code execution
by Remi Gacogne 08 Jul '15

08 Jul '15

Arch Linux Security Advisory ASA-201507-7 ========================================= Severity: Critical Date : 2015-07-08 CVE-ID : CVE-2015-5119 Package : flashplugin Type : remote code execution Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package flashplugin before version 11.2.202.481-1 is vulnerable to remote code execution. Resolution ========== Upgrade to 11.2.202.481-1. # pacman -Syu "flashplugin>=11.2.202.481-1" The problem has been fixed upstream in version 11.2.202.481. Workaround ========== None. Description =========== A critical vulnerability (use-after-free in the AS3 ByteArray class) has been identified in Adobe Flash Player 18.0.0.194 and earlier versions for Windows, Macintosh and Linux. Successful exploitation could cause a crash and potentially allow an attacker to take control of the affected system. Adobe is aware of reports that an exploit targeting this vulnerability has been published publicly. Impact ====== A remote attacker can execute arbitrary code on the affected host using a crafted flash application. References ========== https://access.redhat.com/security/cve/CVE-2015-5119 https://helpx.adobe.com/security/products/flash-player/apsa15-03.html https://www.kb.cert.org/vuls/id/561288 http://blog.trendmicro.com/trendlabs-security-intelligence/unpatched-flash-…

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[arch-security] [ASA-201507-6] bind: denial of service
by Remi Gacogne 07 Jul '15

07 Jul '15

Arch Linux Security Advisory ASA-201507-6 ========================================= Severity: High Date : 2015-07-07 CVE-ID : CVE-2015-4620 Package : bind Type : denial of service Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package bind before version 9.10.2.P2-1 is vulnerable to denial of service. Resolution ========== Upgrade to 9.10.2.P2-1. # pacman -Syu "bind>=9.10.2.P2-1" The problem has been fixed upstream in version 9.10.2.P2. Workaround ========== Disabling DNSSEC validation prevents exploitation of this defect but is not generally recommended. The recommended solution is to upgrade to a patched version. DNSSEC validation can be disabled by setting dnssec-validation no; in the "options" section of /etc/named.conf Description =========== A very uncommon combination of zone data has been found that triggers a bug in BIND, with the result that named will exit with a "REQUIRE" failure in name.c when validating the data returned in answer to a recursive query. This means that a recursive resolver that is performing DNSSEC validation can be deliberately stopped by an attacker who can cause the resolver to perform a query against a maliciously-constructed zone. Impact ====== A remote attacker can crash a bind resolver performing DNSSEC validation by querying it for a specially crafted zone. References ========== https://kb.isc.org/article/AA-01267/ http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4620

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[arch-security] [ASA-201507-5] ntp: denial of service
by Levente Polyak 07 Jul '15

07 Jul '15

Arch Linux Security Advisory ASA-201507-5 ========================================= Severity: Low Date : 2015-07-07 CVE-ID : CVE-2015-5146 Package : ntp Type : denial of service Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package ntp before version 4.2.8.p3-1 is vulnerable to denial of service. Resolution ========== Upgrade to 4.2.8.p3-1. # pacman -Syu "ntp>=4.2.8.p3-1" The problem has been fixed upstream in version 4.2.8.p3. Workaround ========== Configure ntpd to not allow remote configuration (default setting). Description =========== Under limited and specific circumstances an attacker can send a crafted remote-configuration packet containing a NUL-byte to cause a vulnerable ntpd instance to crash. This requires each of the following to be true: - ntpd set up to allow for remote configuration (not allowed by default) - knowledge of the configuration password - access to a computer entrusted to perform remote configuration Impact ====== A remote attacker is able to send a specially crafted remote-configuration packet that is leading to an application crash resulting in denial of service. References ========== https://support.ntp.org/bin/view/Main/SecurityNotice#June_2015_NTP_Security… https://access.redhat.com/security/cve/CVE-2015-5146

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[arch-security] [ASA-201507-4] openssh: XSECURITY restrictions bypass
by Levente Polyak 04 Jul '15

04 Jul '15

Arch Linux Security Advisory ASA-201507-4 ========================================= Severity: Medium Date : 2015-07-04 CVE-ID : CVE-2015-5352 Package : openssh Type : XSECURITY restrictions bypass Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package openssh before version 6.9p1-1 is vulnerable to XSECURITY restrictions bypass. Resolution ========== Upgrade to 6.9p1-1. # pacman -Syu "openssh>=6.9p1-1" The problem has been fixed upstream in version 6.9p1. Workaround ========== None. Description =========== When forwarding X11 connections with ForwardX11Trusted=no, connections made after ForwardX11Timeout expired could be permitted and no longer subject to XSECURITY restrictions because of an ineffective timeout check in ssh coupled with "fail open" behaviour in the X11 server when clients attempted connections with expired credentials. This problem was reported by Jann Horn. Impact ====== A remote attacker is able to bypass the XSECURITY restrictions when forwarding X11 connections by making use of an ineffective timeout check. References ========== http://www.openssh.com/txt/release-6.9 https://access.redhat.com/security/cve/CVE-2015-5352

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