Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2009-4193

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

Published: Dec 03, 2009 | Modified: Aug 17, 2017
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
3.3 LOW
AV:L/AC:M/Au:N/C:N/I:P/A:P
RedHat/V2
2.1 LOW
AV:L/AC:L/Au:N/C:N/I:P/A:N
RedHat/V3
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2009-4193
CWEhttps://cwe.mitre.org/data/definitions/59.html

Merkaartor 0.14 allows local users to append data to arbitrary files via a symlink attack on the /tmp/merkaartor.log temporary file.

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
Merkaartor Merkaartor 0.14 (including) 0.14 (including)
Merkaartor Ubuntu intrepid *
Merkaartor Ubuntu jaunty *
Merkaartor Ubuntu karmic *
Merkaartor Ubuntu maverick *
Merkaartor Ubuntu natty *
Merkaartor Ubuntu oneiric *
Merkaartor Ubuntu quantal *
Merkaartor Ubuntu raring *
Merkaartor Ubuntu saucy *
Merkaartor Ubuntu upstream *
Merkaartor Ubuntu utopic *
Merkaartor Ubuntu vivid *
Merkaartor Ubuntu wily *

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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