Input validation error in Perl - CVE-2011-2939
Published: January 13, 2012 / Updated: August 4, 2020
Vulnerability identifier: #VU33957
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2011-2939
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Perl
Affected software:
Perl
Perl
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Off-by-one error in the decode_xs function in Unicode/Unicode.xs in the Encode module before 2.44, as used in Perl before 5.15.6, might allow context-dependent attackers to cause a denial of service (memory corruption) via a crafted Unicode string, which triggers a heap-based buffer overflow.
How to mitigate CVE-2011-2939
Install update from vendor's website.
Sources
- http://cpansearch.perl.org/src/FLORA/perl-5.14.2/pod/perldelta.pod
- http://perl5.git.perl.org/perl.git/commitdiff/e46d973584785af1f445c4dedbee4243419cb860#patch5
- http://search.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_(CVE-2011-2939)
- http://secunia.com/advisories/46172
- http://secunia.com/advisories/46989
- http://secunia.com/advisories/51457
- http://secunia.com/advisories/55314
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:008
- http://www.openwall.com/lists/oss-security/2011/08/18/8
- http://www.openwall.com/lists/oss-security/2011/08/19/17
- http://www.redhat.com/support/errata/RHSA-2011-1424.html
- http://www.securityfocus.com/bid/49858
- http://www.ubuntu.com/usn/USN-1643-1
- https://bugzilla.redhat.com/show_bug.cgi?id=731246