CVE Vulnerabilities


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

Published: Oct 02, 2008 | Modified: Aug 08, 2017
CVSS 3.x
CVSS 2.x
7.2 HIGH

Race condition in the jas_stream_tmpfile function in libjasper/base/jas_stream.c in JasPer 1.900.1 allows local users to cause a denial of service (program exit) by creating the appropriate tmp.XXXXXXXXXX temporary file, which causes Jasper to exit. NOTE: this was originally reported as a symlink issue, but this was incorrect. NOTE: some vendors dispute the severity of this issue, but it satisfies CVEs requirements for inclusion.


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
Jasper Jasper_project 1.900.1 1.900.1
Jasper Ubuntu dapper *
Jasper Ubuntu feisty *
Jasper Ubuntu gutsy *
Jasper Ubuntu hardy *
Jasper Ubuntu intrepid *
Jasper 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.