Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2011-4105

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

Published: Feb 17, 2012 | Modified: Mar 08, 2014
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
RedHat/V3
Ubuntu
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2011-4105
CWEhttps://cwe.mitre.org/data/definitions/59.html

LightDM before 1.0.6 allows local users to change ownership of arbitrary files via a symlink attack on ~/.Xauthority.

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
Lightdm Robert_ancell 0.1.0 0.1.0
Lightdm Robert_ancell 0.0.1 0.0.1
Lightdm Robert_ancell 0.3.5 0.3.5
Lightdm Robert_ancell 0.9.6 0.9.6
Lightdm Robert_ancell 0.0.2 0.0.2
Lightdm Robert_ancell 0.2.0 0.2.0
Lightdm Robert_ancell 0.0.4 0.0.4
Lightdm Robert_ancell 0.1.1 0.1.1
Lightdm Robert_ancell 0.3.0 0.3.0
Lightdm Robert_ancell 1.1.0 1.1.0
Lightdm Robert_ancell 0.4.1 0.4.1
Lightdm Robert_ancell 1.0.4 1.0.4
Lightdm Robert_ancell 0.9.8 0.9.8
Lightdm Robert_ancell 0.9.1 0.9.1
Lightdm Robert_ancell 0.4.0 0.4.0
Lightdm Robert_ancell 1.0.1 1.0.1
Lightdm Robert_ancell 1.0.2 1.0.2
Lightdm Robert_ancell 0.3.2 0.3.2
Lightdm Robert_ancell 0.2.1 0.2.1
Lightdm Robert_ancell 0.3.4 0.3.4
Lightdm Robert_ancell 0.9.5 0.9.5
Lightdm Robert_ancell 1.0.0 1.0.0
Lightdm Robert_ancell 0.9.0 0.9.0
Lightdm Robert_ancell 0.4.2 0.4.2
Lightdm Robert_ancell 0.2.3 0.2.3
Lightdm Robert_ancell 0.9.7 0.9.7
Lightdm Robert_ancell * 1.0.5
Lightdm Robert_ancell 0.9.4 0.9.4
Lightdm Robert_ancell 0.4.3 0.4.3
Lightdm Robert_ancell 0.9.3 0.9.3
Lightdm Robert_ancell 1.0.3 1.0.3
Lightdm Robert_ancell 0.3.1 0.3.1
Lightdm Robert_ancell 0.1.2 0.1.2
Lightdm Robert_ancell 0.3.6 0.3.6
Lightdm Robert_ancell 0.3.3 0.3.3
Lightdm Robert_ancell 0.2.2 0.2.2
Lightdm Robert_ancell 0.4.4 0.4.4
Lightdm Robert_ancell 0.0.3 0.0.3
Lightdm Robert_ancell 0.9.2 0.9.2

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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