CVE Vulnerabilities

CVE-2008-5374

Improper Link Resolution Before File Access ('Link Following')

Published: Dec 08, 2008 | Modified: Nov 21, 2024
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
6.9 MEDIUM
AV:L/AC:M/Au:N/C:C/I:C/A:C
RedHat/V2
1.2 LOW
AV:L/AC:H/Au:N/C:N/I:P/A:N
RedHat/V3
Ubuntu
LOW

bash-doc 3.2 allows local users to overwrite arbitrary files via a symlink attack on a /tmp/cb#####.? temporary file, related to the (1) aliasconv.sh, (2) aliasconv.bash, and (3) cshtobash scripts.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name Vendor Start Version End Version
Bash-doc Matthias_klose 3.2 (including) 3.2 (including)
Red Hat Enterprise Linux 4 RedHat bash-0:3.0-27.el4 *
Red Hat Enterprise Linux 5 RedHat bash-0:3.2-32.el5 *
Bash Ubuntu dapper *
Bash Ubuntu gutsy *
Bash Ubuntu hardy *
Bash Ubuntu intrepid *
Bash Ubuntu jaunty *
Bash Ubuntu upstream *

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References