Input validation error in GNU C Library (glibc) - CVE-2012-6656
Published: July 1, 2017 / Updated: June 3, 2025
Vulnerability identifier: #VU110111
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2012-6656
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
iconvdata/ibm930.c in GNU C Library (aka glibc) before 2.16 allows context-dependent attackers to cause a denial of service (out-of-bounds read) via a multibyte character value of "0xffff" to the iconv function when converting IBM930 encoded data to UTF-8.
Affected software
GNU C Library (glibc)
Gentoo Linux
sys-libs/glibc
Gentoo Linux
sys-libs/glibc
How to mitigate CVE-2012-6656
Install update from vendor's website.
GNU C Library (glibc) - update to 2.16
sys-libs/glibc - update to 2.19-r1
sys-libs/glibc - update to 2.19-r1
External References
- http://www.debian.org/security/2015/dsa-3142
- http://www.mandriva.com/security/advisories?name=MDVSA-2014:175
- http://www.openwall.com/lists/oss-security/2014/08/29/3
- http://www.openwall.com/lists/oss-security/2014/09/02/1
- http://www.securityfocus.com/bid/69472
- http://www.ubuntu.com/usn/USN-2432-1
- https://security.gentoo.org/glsa/201503-04
- https://sourceware.org/bugzilla/show_bug.cgi?id=14134
- https://sourceware.org/git/?p=glibc.git;a=commit;h=6e230d11837f3ae7b375ea69d7905f0d18eb79e5