Public Date:
826943: CVE-2012-3406 glibc: printf() unbound alloca() usage in case of positional parameters + many format specs

The MITRE CVE dictionary describes this issue as:

The vfprintf function in stdio-common/vfprintf.c in GNU C Library (aka glibc) 2.5, 2.12, and probably other versions 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, a different vulnerability than CVE-2012-3404 and CVE-2012-3405.

Find out more about CVE-2012-3406 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 6.8
Base Metrics AV:N/AC:M/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (glibc) RHSA-2012:1098 2012-07-18
Red Hat Enterprise Virtualization Hypervisor 5 (rhev-hypervisor5) RHSA-2012:1185 2012-08-21
Red Hat Enterprise Linux version 5 (glibc) RHSA-2012:1097 2012-07-18
RHEV Hypervisor for RHEL-6 (rhev-hypervisor6) RHSA-2012:1200 2012-08-23