bzip2 compressed files could inherit the permissions of a symbolic link
| bzip2-compression-symlink (9128) |  Medium Risk |
Description:
bzip2 could allow a file to inherit the permissions of a symbolically linked file when the file is compressed. This would cause the file to potentially have insecure permissions when decompressed.
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:
Obtain Information
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-4776: bzip2 Archive Inherited Symbolic Link Permissions Vulnerability
- CVE-2002-0761: bzip2 before 1.0.2 in FreeBSD 4.5 and earlier, OpenLinux 3.1 and 3.1.1, and possibly systems, uses the permissions of symbolic links instead of the actual files when creating an archive, which could cause the files to be extracted with less restrictive permissions than intended.
Reported:
May 20, 2002
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