bzip2 could overwrite files during file decompression

bzip2-decompression-file-overwrite (9126) The risk level is classified as MediumMedium Risk

Description:

bzip2 fails to properly check for the prior existence of files during decompression, which could cause arbitrary files to be overwritten.


Consequences:

File Manipulation

Remedy:

Upgrade to the latest version of bzip2 (1.0.2 or later), available from the bzip2 Web page. See References.

For FreeBSD:
Apply the patch for this vulnerability, as listed in FreeBSD Security Advisory FreeBSD-SA-02:25. See References.

For CalderaOpenLinux Server and Workstation 3.1 and 3.1.1:
Upgrade to the latest bzip2 package (1.0.0-7MR or later) as listed in SCO Security Advisory CSSA-2002-039.0. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

  • bzip2 Web site: The bzip2 and libbzip2 official home page.
  • FreeBSD Security Advisory FreeBSD-SA-02:25: bzip2 contains multiple security vulnerabilities.
  • SCO Security Advisory CSSA-2002-039.0: Linux: bzip2 file creation and symbolic link vulnerabilities.
  • BID-4774: bzip2 Decompression File Overwrite Vulnerability
  • CVE-2002-0759: bzip2 before 1.0.2 in FreeBSD 4.5 and earlier, OpenLinux 3.1 and 3.1.1, and possibly other operating systems, does not use the O_EXCL flag to create files during decompression and does not warn the user if an existing file would be overwritten, which could allow attackers to overwrite files via a bzip2 archive.
  • OSVDB ID: 5117: bzip2 Decompress Overwrite Arbitrary Files

Platforms Affected:

  • FreeBSD FreeBSD 4.4
  • FreeBSD FreeBSD 4.5
  • Julian Seward bzip2 1.0.1 and prior
  • SCO Caldera OpenLinux Server 3.1
  • SCO Caldera OpenLinux Server 3.1.1
  • SCO Caldera OpenLinux Workstation 3.1
  • SCO Caldera OpenLinux Workstation 3.1.1

Reported:

May 20, 2002

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