Perl PERLIO_DEBUG environment variable buffer overflow

perl-perliodebug-bo (19208) The risk level is classified as HighHigh Risk


Perl (Practical Extraction and Reporting Language) is vulnerable to a buffer overflow, caused by improper bounds checking of user-supplied input in the PERLIO_DEBUG environment variable. By sending a specially-crafted long PERLIO_DEBUG environment variable to Perl, a local attacker could overflow a buffer and execute arbitrary code on the system with root privileges.


Gain Access


For Ubuntu Linux:
Upgrade to the latest perl package (5.8.4-2ubuntu0.3 or later), as listed in USN-72-1 February 02, 2005. See References.

For Red Hat Linux:
Refer to RHSA-2005:103-04 or RHSA-2005:105-11 for patch, upgrade, or suggested workaround information. See References.

For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 2005-02-13 for patch, upgrade, or suggested workaround information. See References.


  • CIAC Information Bulletin P-122: Updated Perl Packages Fix Security Issues.
  • BID-12426: Perl SuidPerl Multiple Local Vulnerabilities
  • CVE-2005-0156: Buffer overflow in the PerlIO implementation in Perl 5.8.0, when installed with setuid support (sperl), allows local users to execute arbitrary code by setting the PERLIO_DEBUG variable and executing a Perl script whose full pathname contains a long directory tree.
  • GLSA-200502-13: Perl: Vulnerabilities in perl-suid wrapper
  • MDKSA-2005:031: Updated perl packages fix multiple vulnerabilities
  • RHSA-2005-103: perl security update
  • RHSA-2005-105: perl security update
  • SA14120: Perl "PERLIO_DEBUG" Privilege Escalation Vulnerabilities
  • SA55314: Oracle Solaris Perl Multiple Vulnerabilities
  • USN-72-1: Perl vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 4.10
  • Gentoo Linux
  • Larry Wall Perl 5
  • MandrakeSoft Mandrake Linux 10.0 AMD64
  • MandrakeSoft Mandrake Linux 10.0
  • MandrakeSoft Mandrake Linux 10.1 X86_64
  • MandrakeSoft Mandrake Linux 10.1
  • MandrakeSoft Mandrake Linux 9.2
  • MandrakeSoft Mandrake Linux 9.2 AMD64
  • MandrakeSoft Mandrake Linux Corporate Server 2.1
  • MandrakeSoft Mandrake Linux Corporate Server 2.1 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • RadiSys Corporation OS-9
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 3 ES
  • RedHat Enterprise Linux 3 Desktop
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 ES


Feb 02, 2005

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