bzip2 could overwrite files during file decompression
| bzip2-decompression-file-overwrite (9126) |  Medium Risk |
Description:
bzip2 is a file compression and decompression utility for multiple Unix and Linux-based operating systems. bzip2 versions 1.0.1 and earlier fail to properly check for the prior existence of files during decompression, which could cause arbitrary files to be overwritten.
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
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.
Consequences:
File Manipulation
References:
- bzip2 Web site, The bzip2 and libbzip2 official home page at http://sources.redhat.com/bzip2/index.html.
- FreeBSD Security Advisory FreeBSD-SA-02:25, bzip2 contains multiple security vulnerabilities at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:25.bzip2.asc.
- SCO Security Advisory CSSA-2002-039.0, Linux: bzip2 file creation and symbolic link vulnerabilities at ftp://ftp.sco.com/pub/security/OpenLinux/CSSA-2002-039.0.txt.
- 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.
Reported:
May 20, 2002
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