Compress::Raw::Zlib module for Perl inflate() function buffer overflow

perl-compressrawzlib-inflate-bo (51062) The risk level is classified as HighHigh Risk


The Compress::Raw::Zlib module for Perl is vulnerable to a heap-based buffer overflow, caused by an off-by-one error in the inflate() function. By persuading a victim to open a .zip file containing a specially-crafted zlib-stream, a remote attacker could overflow a buffer and execute arbitrary code on the system with elevated privileges or cause the affected application to crash.


Base Score: 6.8
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
Temporal Score: 5
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Gain Access


Upgrade to the latest version of Compress::Raw::Zlib (2.017 or later), available from the Paul Marquess Compress-Raw-Zlib Web site. See References.


  • Paul Marquess Compress-Raw-Zlib Web site: Compress::Raw::Zlib.
  • Red Hat Bugzilla Bug 504386: CVE-2009-1391 Buffer overflow in Compress::Raw::Zlib.
  • BID-35307: 'Compress::Raw::Zlib' Perl Module Remote Code Execution Vulnerability
  • CVE-2009-1391: Off-by-one error in the inflate function in Zlib.xs in Compress::Raw::Zlib Perl module before 2.017, as used in AMaViS, SpamAssassin, and possibly other products, allows context-dependent attackers to cause a denial of service (hang or crash) via a crafted zlib compressed stream that triggers a heap-based buffer overflow, as exploited in the wild by Trojan.Downloader-71014 in June 2009.
  • OSVDB ID: 55041: Perl Compress::Raw::Zlib Module Zlib.xs inflate() Function Overflow
  • OSVDB ID: 57174: Perl Compress::Raw::Bzip2 Module Bzip2.xs bzinflate() Function Off-by-One Overflow
  • SA35422: Perl Compress::Raw::Zlib Module Off-by-One Vulnerability
  • SA36386: Perl Compress::Raw::Bzip2 Module Off-by-One Vulnerability
  • SA37534: ActivePerl Compress Modules Off-by-One Vulnerabilities
  • SUSE-SR:2009:012: SUSE Security Summary Report
  • USN-794-1: Perl vulnerability

Platforms Affected:

  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Paul Marquess Compress::Raw::Zlib 2.014
  • Paul Marquess Compress::Raw::Zlib 2.015


Jun 11, 2009

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