CVE Database


Impact: Moderate
Public: 2012-07-11
Bugzilla: 826943: CVE-2012-3406 glibc: printf() unbound alloca() usage in case of positional parameters + many format specs
IAVA: 2015-A-0038


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 and NIST NVD.

CVSS v2 metrics

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
RHEV Hypervisor for RHEL-5 (rhev-hypervisor5) RHSA-2012:1185 August 21, 2012
RHEV Hypervisor for RHEL-6 (rhev-hypervisor6) RHSA-2012:1200 August 23, 2012
Red Hat Enterprise Linux version 5 (glibc) RHSA-2012:1097 July 18, 2012
Red Hat Enterprise Linux version 6 (glibc) RHSA-2012:1098 July 18, 2012

External References

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