June 2017 - Arch-security - lists.archlinux.org

[arch-security] [ASA-201706-35] libnl: privilege escalation
by Christian Rebischke 28 Jun '17

28 Jun '17

Arch Linux Security Advisory ASA-201706-35 ========================================== Severity: Medium Date : 2017-06-28 CVE-ID : CVE-2017-0553 Package : libnl Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-292 Summary ======= The package libnl before version 3.3.0-1 is vulnerable to privilege escalation. Resolution ========== Upgrade to 3.3.0-1. # pacman -Syu "libnl>=3.3.0-1" The problem has been fixed upstream in version 3.3.0. Workaround ========== None. Description =========== An integer overflow vulnerability has been found in the nlmsg_reserve() function of libnl < 3.3.0, allowing local privilege escalation. Impact ====== A local attacker is able to escalate privileges. References ========== http://git.infradead.org/users/tgr/libnl.git/commitdiff/3e18948f17148e6a3c4… https://security.archlinux.org/CVE-2017-0553

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[arch-security] [ASA-201706-34] apache: multiple issues
by Santiago Torres-Arias 28 Jun '17

28 Jun '17

Arch Linux Security Advisory ASA-201706-34 ========================================== Severity: High Date : 2017-06-28 CVE-ID : CVE-2017-3167 CVE-2017-3169 CVE-2017-7659 CVE-2017-7668 CVE-2017-7679 Package : apache Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-316 Summary ======= The package apache before version 2.4.26-1 is vulnerable to multiple issues including denial of service, information disclosure and authentication bypass. Resolution ========== Upgrade to 2.4.26-1. # pacman -Syu "apache>=2.4.26-1" The problems have been fixed upstream in version 2.4.26. Workaround ========== None. Description =========== - CVE-2017-3167 (authentication bypass) An authentication bypass flaw has been found in Apache httpd < 2.4.26, where the use of the ap_get_basic_auth_pw() function by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed. Third-party module writers SHOULD use ap_get_basic_auth_components(), available in 2.2.33 and 2.4.26, instead of ap_get_basic_auth_pw(). Modules which call the legacy ap_get_basic_auth_pw() during the authentication phase MUST either immediately authenticate the user after the call, or else stop the request immediately with an error response, to avoid incorrectly authenticating the current request. - CVE-2017-3169 (denial of service) A NULL-pointer dereference leading to denial of service has been found in the mod_ssl component of Apache httpd < 2.4.26. mod_ssl may dereference a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port. - CVE-2017-7659 (denial of service) A NULL-pointer dereference leading to denial of service has been found in the mod_http2 component of Apache httpd < 2.4.26. A maliciously constructed HTTP/2 request could cause mod_http2 to dereference a NULL pointer and crash the server process. - CVE-2017-7668 (information disclosure) An out-of-bounds read has been found in Apache httpd < 2.4.26. The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value. - CVE-2017-7679 (denial of service) An out-of-bounds read has been found in Apache httpd < 2.4.26, where mod_mime can read one byte past the end of a buffer when a malicious Content-Type response header is sent. Impact ====== A remote attacker can crash an apache server or obtain sensitive information from the host by performing a maliciously-crafted HTTP request. In addition, a malicious attacker can bypass a server's authentication requirements via maliciously-crafted request headers. References ========== https://httpd.apache.org/security/vulnerabilities_24.html https://www.apache.org/dist/httpd/patches/apply_to_2.2.32/CVE-2017-3167.pat… https://security.archlinux.org/CVE-2017-3167 https://security.archlinux.org/CVE-2017-3169 https://security.archlinux.org/CVE-2017-7659 https://security.archlinux.org/CVE-2017-7668 https://security.archlinux.org/CVE-2017-7679

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[arch-security] [ASA-201706-33] poppler: arbitrary code execution
by Santiago Torres-Arias 26 Jun '17

26 Jun '17

Arch Linux Security Advisory ASA-201706-33 ========================================== Severity: High Date : 2017-06-26 CVE-ID : CVE-2017-9775 CVE-2017-9776 Package : poppler Type : arbitrary code execution Remote : Yes Link : https://security.archlinux.org/AVG-326 Summary ======= The package poppler before version 0.56.0-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 0.56.0-1. # pacman -Syu "poppler>=0.56.0-1" The problems have been fixed upstream in version 0.56.0. Workaround ========== None. Description =========== - CVE-2017-9775 (arbitrary code execution) A stack buffer overflow in has been found in GfxState.cc's module of poppler. Due to some restrictions in the lines after the bug, an attacker can't control the values written in the stack so it unlikely this could lead to a code execution. - CVE-2017-9776 (arbitrary code execution) Integer overflow leading to heap overflow in JBIG2Stream.cc. Impact ====== An attacker might be able to execute arbitrary code on the affected host by tricking the user into opening a crafted PDF document. References ========== https://bugs.freedesktop.org/show_bug.cgi?id=101541 https://bugs.freedesktop.org/show_bug.cgi?id=101540 https://cgit.freedesktop.org/poppler/poppler/commit/?id=8f4ff8243a3d599ff2a… https://cgit.freedesktop.org/poppler/poppler/commit/?id=a3a98a6d83dfbf49f56… https://security.archlinux.org/CVE-2017-9775 https://security.archlinux.org/CVE-2017-9776

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[arch-security] [ASA-201706-32] expat: denial of service
by Remi Gacogne 26 Jun '17

26 Jun '17

Arch Linux Security Advisory ASA-201706-32 ========================================== Severity: Medium Date : 2017-06-26 CVE-ID : CVE-2016-9063 CVE-2017-9233 Package : expat Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-306 Summary ======= The package expat before version 2.2.1-1 is vulnerable to denial of service. Resolution ========== Upgrade to 2.2.1-1. # pacman -Syu "expat>=2.2.1-1" The problems have been fixed upstream in version 2.2.1. Workaround ========== None. Description =========== - CVE-2016-9063 (denial of service) An integer overflow vulnerability has been discovered during the parsing of XML using the Expat library. - CVE-2017-9233 (denial of service) An external entity infinite loop issue has been found in Expat < 2.2.1, leading to a denial of service. Impact ====== An attacker can cause a denial of service in an application using expat by sending a crafted XML payload. References ========== https://www.mozilla.org/en-US/security/advisories/mfsa2016-89/#CVE-2016-9063 https://github.com/libexpat/libexpat/commit/d4f735b88d9932bd5039df2335eefdd… https://libexpat.github.io/doc/cve-2017-9233/ https://security.archlinux.org/CVE-2016-9063 https://security.archlinux.org/CVE-2017-9233

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[arch-security] [ASA-201706-31] linux: privilege escalation
by Levente Polyak 24 Jun '17

24 Jun '17

Arch Linux Security Advisory ASA-201706-31 ========================================== Severity: High Date : 2017-06-23 CVE-ID : CVE-2017-1000364 Package : linux Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-313 Summary ======= The package linux before version 4.11.6-3 is vulnerable to privilege escalation. Resolution ========== Upgrade to 4.11.6-3. # pacman -Syu "linux>=4.11.6-3" The problem has been fixed upstream but no release is available yet. Workaround ========== None. Description =========== A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. Impact ====== A local attacker is able to bypass the stack guard for user space binaries effectively leading to elevation of privileges by choosing a suitable target application. References ========== https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt https://git.kernel.org/linus/1be7107fbe18eed3e319a6c3e83c78254b693acb https://security.archlinux.org/CVE-2017-1000364

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[arch-security] [ASA-201706-30] linux-zen: privilege escalation
by Levente Polyak 24 Jun '17

24 Jun '17

Arch Linux Security Advisory ASA-201706-30 ========================================== Severity: High Date : 2017-06-23 CVE-ID : CVE-2017-1000364 Package : linux-zen Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-324 Summary ======= The package linux-zen before version 4.11.6-3 is vulnerable to privilege escalation. Resolution ========== Upgrade to 4.11.6-3. # pacman -Syu "linux-zen>=4.11.6-3" The problem has been fixed upstream but no release is available yet. Workaround ========== None. Description =========== A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. Impact ====== A local attacker is able to bypass the stack guard for user space binaries effectively leading to elevation of privileges by choosing a suitable target application. References ========== https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt https://git.kernel.org/linus/1be7107fbe18eed3e319a6c3e83c78254b693acb https://security.archlinux.org/CVE-2017-1000364

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[arch-security] [ASA-201706-29] tcpreplay: arbitrary code execution
by Santiago Torres-Arias 24 Jun '17

24 Jun '17

Arch Linux Security Advisory ASA-201706-29 ========================================== Severity: High Date : 2017-06-23 CVE-ID : CVE-2017-6429 Package : tcpreplay Type : arbitrary code execution Remote : No Link : https://security.archlinux.org/AVG-211 Summary ======= The package tcpreplay before version 4.2.5-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 4.2.5-1. # pacman -Syu "tcpreplay>=4.2.5-1" The problem has been fixed upstream in version 4.2.5. Workaround ========== None. Description =========== Buffer overflow in the tcpcapinfo utility in tcpreplay before 4.2.0 Beta 1 allows attackers to have unspecified impact via a pcap file with an over-size packet. Impact ====== An attacker can provide a crafted pcap file with an over-size packet to execute arbitrary code with the privileges of the tcpcapinfo process. References ========== https://github.com/appneta/tcpreplay/commit/d689d14dbcd768c028eab2fb378d849… https://github.com/appneta/tcpreplay/issues/278 http://www.securityfocus.com/bid/96579 https://security.archlinux.org/CVE-2017-6429

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[arch-security] [ASA-201706-28] linux-hardened: privilege escalation
by Levente Polyak 22 Jun '17

22 Jun '17

Arch Linux Security Advisory ASA-201706-28 ========================================== Severity: High Date : 2017-06-22 CVE-ID : CVE-2017-1000364 Package : linux-hardened Type : privilege escalation Remote : No Link : https://security.archlinux.org/AVG-314 Summary ======= The package linux-hardened before version 4.11.6.d-1 is vulnerable to privilege escalation. Resolution ========== Upgrade to 4.11.6.d-1. # pacman -Syu "linux-hardened>=4.11.6.d-1" The problem has been fixed upstream in version 4.11.6.d. Workaround ========== None. Description =========== A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. Impact ====== A local attacker is able to bypass the stack guard for user space binaries effectively leading to elevation of privileges by choosing a suitable target application. References ========== https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt https://github.com/copperhead/linux-hardened/commit/f8551076b4fade2df491a3b… https://git.kernel.org/linus/1be7107fbe18eed3e319a6c3e83c78254b693acb https://security.archlinux.org/CVE-2017-1000364

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[arch-security] [ASA-201706-27] openvpn: multiple issues
by Remi Gacogne 22 Jun '17

22 Jun '17

Arch Linux Security Advisory ASA-201706-27 ========================================== Severity: Critical Date : 2017-06-22 CVE-ID : CVE-2017-7508 CVE-2017-7512 CVE-2017-7520 CVE-2017-7521 Package : openvpn Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-318 Summary ======= The package openvpn before version 2.4.3-1 is vulnerable to multiple issues including information disclosure, arbitrary code execution and denial of service. Resolution ========== Upgrade to 2.4.3-1. # pacman -Syu "openvpn>=2.4.3-1" The problems have been fixed upstream in version 2.4.3. Workaround ========== None. Description =========== - CVE-2017-7508 (denial of service) A remote denial of service has been found in OpenVPN < 2.4.3, allowing a remote client to crash a server by sending a malformed IPv6 packet. The issue requires IPv6 and the --mssfix option to be enabled, and knowledge of the IPv6 networks used inside the VPN. - CVE-2017-7512 (denial of service) A remote denial of service has been found in OpenVPN < 2.4.3. A remote client can exploit a memory leak in the server's certificate parsing code to make it leak a few bytes of memory for each connection attempt, causing it to run out of memory. - CVE-2017-7520 (information disclosure) A pre-authentication remote crash/information disclosure vulnerability has been discovered in OpenVPN < 2.4.3. If the client uses a HTTP proxy with NTLM authentication (i.e. "--http-proxy <server> <port> [<authfile>|'auto'|'auto-nct'] ntlm2") to connect to the OpenVPN server, an attacker in position of man-in-the-middle between the client and the proxy can cause the client to crash or disclose at most 96 bytes of stack memory. The disclosed stack memory is likely to contain the proxy password. - CVE-2017-7521 (arbitrary code execution) A use-after-free has been found in OpenVPN < 2.4.3. The issue is caused by extract_x509_extension() not checking the return value of ASN1_STRING_to_UTF8(), and using then freeing a memory allocation that has already been freed if it failed. The issue requires the use of the --x509-alt-username option with an x509 extension, and is very unlikely to be triggered unless the remote peer can make the local process run out of memory. Impact ====== An attacker in position of man-in-the-middle can access sensitive information from a client using a HTTP proxy with NTLM authentication to connect to the server. A remote attacker can crash a server and possibly execute arbitrary code on the affected host under specific conditions. References ========== https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 https://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bo… https://github.com/OpenVPN/openvpn/commit/c3f47077a7 https://github.com/OpenVPN/openvpn/commit/2341f71619 https://github.com/OpenVPN/openvpn/commit/7718c8984f https://github.com/OpenVPN/openvpn/commit/cb4e35ece4 https://github.com/OpenVPN/openvpn/commit/2d032c7fcd https://security.archlinux.org/CVE-2017-7508 https://security.archlinux.org/CVE-2017-7512 https://security.archlinux.org/CVE-2017-7520 https://security.archlinux.org/CVE-2017-7521

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[arch-security] [ASA-201706-26] pcmanfm: denial of service
by Remi Gacogne 22 Jun '17

22 Jun '17

Arch Linux Security Advisory ASA-201706-26 ========================================== Severity: Medium Date : 2017-06-22 CVE-ID : CVE-2017-8934 Package : pcmanfm Type : denial of service Remote : No Link : https://security.archlinux.org/AVG-274 Summary ======= The package pcmanfm before version 1.2.5-2 is vulnerable to denial of service. Resolution ========== Upgrade to 1.2.5-2. # pacman -Syu "pcmanfm>=1.2.5-2" The problem has been fixed upstream but no release is available yet. Workaround ========== None. Description =========== The socket placed in /tmp by pcmanfm is predictable and public- writable. Therefore if one user placed a symlink to another socket instead of socket for another user then said another user will either be unable to use pcmanfm, or may send requests to the first user's pcmanfm. Impact ====== A local attacker might be able to cause a denial of service or trick the user into sending requests to another pcmanfm instance. References ========== https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=862571 https://git.lxde.org/gitweb/?p=lxde/pcmanfm.git;a=commitdiff;h=bc8c3d871e9e… https://security.archlinux.org/CVE-2017-8934

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