bzip2 file decompression race condition could create world readable files

bzip2-decompression-race-condition (9127) The risk level is classified as MediumMedium Risk

Description:

bzip2 is vulnerable to a race condition that occurs between creating a new file and setting the files permissions, which could cause a file to be created with world readable permissions. This could allow a local attacker to access these files and potentially gain sensitive information.


Consequences:

Obtain Information

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-4775: bzip2 Insecure Decompressed File Permissions Vulnerability
  • CVE-2002-0760: Race condition in bzip2 before 1.0.2 in FreeBSD 4.5 and earlier, OpenLinux 3.1 and 3.1.1, and possibly other operating systems, decompresses files with world-readable permissions before setting the permissions to what is specified in the bzip2 archive, which could allow local users to read the files as they are being decompressed.
  • OSVDB ID: 5116: bzip2 File Decompress Permission Arbitrary File Access

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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