Perl up to 5.8.9 decode_xs numeric error

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7.0$0-$5k0.00

A vulnerability classified as critical has been found in Perl up to 5.8.9 (Programming Language Software). Affected is the function decode_xs. The manipulation with an unknown input leads to a numeric error vulnerability. CWE is classifying the issue as CWE-189. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was disclosed 01/13/2012 by Clement Lecigne as Bug 731246 as not defined bug report (Bugzilla). The advisory is available at bugzilla.redhat.com. This vulnerability is traded as CVE-2011-2939 since 07/27/2011. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 69578 (Amazon Linux AMI : perl (ALAS-2011-19)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 156007 (Oracle Enterprise Linux Update for Perl (ELSA-2011-1424)).

Upgrading to version 5.8.10 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (69578). The entry 63227 is pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Numeric error
CWE: CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 69578
Nessus Name: Amazon Linux AMI : perl (ALAS-2011-19)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 803343
OpenVAS Name: Active Perl Modules Multiple Vulnerabilities (Windows)
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Perl 5.8.10

Timelineinfo

07/27/2011 🔍
09/29/2011 +64 days 🔍
11/09/2011 +41 days 🔍
11/24/2011 +15 days 🔍
01/13/2012 +50 days 🔍
01/13/2012 +0 days 🔍
09/04/2013 +600 days 🔍
03/23/2015 +565 days 🔍
04/23/2019 +1492 days 🔍

Sourcesinfo

Advisory: Bug 731246
Researcher: Clement Lecigne
Status: Not defined
Confirmation: 🔍

CVE: CVE-2011-2939 (🔍)
OVAL: 🔍

SecurityFocus: 49858 - Perl 'decode_xs()' and 'File::Glob::bsd_glob()' Remote Code Execution Vulnerabilities
Secunia: 46989 - SUSE update for perl, Moderately Critical

See also: 🔍

Entryinfo

Created: 03/23/2015 16:50
Updated: 04/23/2019 11:28
Changes: 03/23/2015 16:50 (75), 04/23/2019 11:28 (2)
Complete: 🔍

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