Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2007-3103

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

Published: Jul 15, 2007 | Modified: Apr 09, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
6.2 MEDIUM
AV:L/AC:H/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2007-3103
CWEhttps://cwe.mitre.org/data/definitions/59.html

The init.d script for the X.Org X11 xfs font server on various Linux distributions might allow local users to change the permissions of arbitrary files via a symlink attack on the /tmp/.font-unix 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

NameVendorStart VersionEnd Version
Fedora_coreFedoraproject6.0 (including)6.0 (including)
Enterprise_linuxRedhat4.0 (including)4.0 (including)
Enterprise_linux_desktopRedhat4.0 (including)4.0 (including)
LinuxRedhat**
Red Hat Enterprise Linux 4RedHatxorg-x11-0:6.8.2-1.EL.19*
Red Hat Enterprise Linux 5RedHatxorg-x11-xfs-1:1.0.2-4*
XfsUbuntudapper*
XfsUbuntudevel*
XfsUbuntuedgy*
XfsUbuntufeisty*
XfsUbuntugutsy*
XfsUbuntuhardy*
XfsUbuntuintrepid*
XfsUbuntujaunty*
XfsUbuntukarmic*

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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