Vulnerability CVE-2011-2939
Published: 2012-01-13   Modified: 2012-02-13

Description:
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.

Type:

CWE-189

 (Numeric Errors)

CVSS2 => (AV:N/AC:H/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.1/10
6.4/10
4.9/10
Exploit range
Attack complexity
Authentication
Remote
High
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
PERL -> PERL 
Dan kogai -> Encode module 

 References:
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://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
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