Arch Linux Security Advisory ASA-201412-21 ========================================== Severity: High Date : 2014-12-18 CVE-ID : CVE-2012-3406 CVE-2014-9402 Package : glibc lib32-glibc Type : arbitrary code execution, denial of service Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE-2014 Summary ======= The packages glibc and lib32-glibc before version 2.20-5 are vulnerable to arbitrary code execution and denial of service. Resolution ========== Upgrade to 2.20-5. # pacman -Syu "glibc>=2.20-5" # pacman -Syu "lib32-glibc>=2.20-5" The problems have been fixed upstream but no release is available yet. Workaround ========== None. Description =========== - CVE-2012-3406 (arbitrary code execution) The vfprintf function in stdio-common/vfprintf.c in GNU C Library does not "properly restrict the use of" the alloca function when allocating the SPECS array, which allows context-dependent attackers to bypass the FORTIFY_SOURCE format-string protection mechanism and cause a denial of service (crash) or possibly execute arbitrary code via a crafted format string using positional parameters and a large number of format specifiers. - CVE-2014-9402 (denial of service) The nss_dns getnetbyname function will enter an infinite loop if the DNS backend is activated in the system Name Service Switch configuration and the DNS resolver receives a positive answer while processing the network name. Impact ====== An attacker is able to perform a denial of service attack or execute arbitrary code via crafted format strings. References ========== https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3406 https://access.redhat.com/security/cve/CVE-2014-9402 https://sourceware.org/bugzilla/show_bug.cgi?id=17630 http://www.openwall.com/lists/oss-security/2014/12/18/1