5.1
MEDIUM
CVE-2011-2939
"Perl Encode Unicode Off-by-One Heap Buffer Overflow"
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.

INFO

Published Date :

Jan. 13, 2012, 6:55 p.m.

Last Modified :

Feb. 13, 2023, 4:32 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

6.4

Exploitability Score :

4.9
Affected Products

The following products are affected by CVE-2011-2939 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Perl perl
1 Dan_kogai encode_module
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2011-2939.

URL Resource
http://cpansearch.perl.org/src/FLORA/perl-5.14.2/pod/perldelta.pod
http://perl5.git.perl.org/perl.git/commitdiff/e46d973584785af1f445c4dedbee4243419cb860#patch5 Exploit Patch
http://search.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_%28CVE-2011-2939%29
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 Patch
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 Patch

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2011-2939 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2011-2939 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 13, 2023

    Action Type Old Value New Value
    Changed Description CVE-2011-2939 Perl decode_xs heap-based buffer overflow 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.
    Removed CVSS V2 Red Hat, Inc. (AV:N/AC:H/Au:N/C:P/I:P/A:P)
    Removed Reference https://access.redhat.com/errata/RHSA-2011:1424 [No Types Assigned]
    Removed Reference https://access.redhat.com/security/cve/CVE-2011-2939 [No Types Assigned]
  • CVE Modified by [email protected]

    Feb. 02, 2023

    Action Type Old Value New Value
    Changed 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. CVE-2011-2939 Perl decode_xs heap-based buffer overflow
    Added CVSS V2 Red Hat, Inc. (AV:N/AC:H/Au:N/C:P/I:P/A:P)
    Removed Reference http://search.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_(CVE-2011-2939) [No Types Assigned]
    Added Reference https://access.redhat.com/security/cve/CVE-2011-2939 [No Types Assigned]
    Added Reference http://search.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_%28CVE-2011-2939%29 [No Types Assigned]
    Added Reference https://access.redhat.com/errata/RHSA-2011:1424 [No Types Assigned]
  • CVE Modified by [email protected]

    Aug. 13, 2018

    Action Type Old Value New Value
    Removed Reference http://search.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_%28CVE-2011-2939%29 [No Types Assigned]
    Added Reference http://search.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_(CVE-2011-2939) [No Types Assigned]
  • Initial Analysis by [email protected]

    Jan. 16, 2012

    Action Type Old Value New Value
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2011-2939 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2011-2939 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

1.90 }} 0.18%

score

0.88789

percentile

CVSS2 - Vulnerability Scoring System
Access Vector
Access Complexity
Authentication
Confidentiality
Integrity
Availability
: