Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2013-6891

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

Published: Jan 26, 2014 | Modified: Mar 06, 2014
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
1.2 LOW
AV:L/AC:H/Au:N/C:P/I:N/A:N
RedHat/V2
1.2 LOW
AV:L/AC:H/Au:N/C:P/I:N/A:N
RedHat/V3
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2013-6891
CWEhttps://cwe.mitre.org/data/definitions/59.html

lppasswd in CUPS before 1.7.1, when running with setuid privileges, allows local users to read portions of arbitrary files via a modified HOME environment variable and a symlink attack involving .cups/client.conf.

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
Cups Apple * 1.7.0 (including)
Cups Apple 1.7-rc1 (including) 1.7-rc1 (including)
Cups Apple 1.7.1-b1 (including) 1.7.1-b1 (including)
Cups Ubuntu quantal *
Cups Ubuntu raring *
Cups Ubuntu saucy *
Cups 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

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