CVE Vulnerabilities

CVE-2008-4983

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

Published: Nov 06, 2008 | Modified: Aug 08, 2017
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
6.9 MEDIUM
AV:L/AC:M/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

scilab-bin 4.1.2 allows local users to overwrite arbitrary files via a symlink attack on (a) /tmp/SciLink#####1, (b) /tmp/SciLink#####2, (c) /tmp/SciLink#####3, (d) /tmp/.#####, (e) /tmp/.#####.res, (f) /tmp/.#####.err, and (g) /tmp/.#####.diff temporary files, related to the (1) scilink, (2) scidoc, and (3) scidem scripts.

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
Scilab-bin Scilab 4.1.2 4.1.2
Scilab Ubuntu dapper *
Scilab Ubuntu gutsy *
Scilab Ubuntu hardy *
Scilab Ubuntu intrepid *
Scilab 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