CVE Vulnerabilities

CVE-2010-2192

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

Published: Jun 18, 2010 | Modified: Jun 22, 2010
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
1.9 LOW
AV:L/AC:M/Au:N/C:N/I:P/A:N
RedHat/V2
1.2 LOW
AV:L/AC:H/Au:N/C:N/I:P/A:N
RedHat/V3
Ubuntu

The make_lockdir_name function in policy.c in pmount 0.9.18 allow local users to overwrite arbitrary files via a symlink attack on a file in /var/lock/.

Weakness

The software 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
Pmount Vincent_fourmond 0.9.18 0.9.18
Pmount Ubuntu dapper *
Pmount Ubuntu hardy *
Pmount Ubuntu jaunty *
Pmount Ubuntu karmic *
Pmount Ubuntu lucid *
Pmount 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