SB2019042230 - Permissions, Privileges, and Access Controls in Glibc

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Main Vulnerability Database SB2019042230

SB2019042230 - Permissions, Privileges, and Access Controls in Glibc

Published: April 22, 2019 Updated: June 3, 2025

Security Bulletin ID SB2019042230
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2012-3406)

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

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.


Remediation

Install update from vendor's website.

References