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Last updated: 9/21/2014 8:12:54 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2012-3406

Original release date: 02/10/2014
Last revised: 02/10/2014
Source: US-CERT/NIST

Overview

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.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 6.8 (MEDIUM) (AV:N/AC:M/Au:N/C:P/I:P/A:P) (legend)
Impact Subscore: 6.4
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: REDHAT
Name: RHSA-2012:1097
External Source: REDHAT
Name: RHSA-2012:1200
External Source: UBUNTU
Name: USN-1589-1
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=826943
External Source: REDHAT
Name: RHSA-2012:1098
External Source: MLIST
Name: [oss-security] 20120711 Re: CVE request: glibc formatted printing vulnerabilities
External Source: REDHAT
Name: RHSA-2012:1185
External Source: CONFIRM
Name: https://bugzilla.redhat.com/attachment.cgi?id=594722

Technical Details

Vulnerability Type (View All)
  • Permissions, Privileges, and Access Control (CWE-264)