Vulnerability in vfprintf function in GNU C Library (glibc) allows for format string exploitation

CVE-2012-3406 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

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.

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