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Fencer Vulns
medium 5.1

CVE-2009-0356 json

Mozilla Firefox before 3.0.6 and SeaMonkey do not block links to the (1) about:plugins and (2) about:config URIs from .desktop files, which…

published 2009-02-04 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0360

cvss
5.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Mozilla Firefox before 3.0.6 and SeaMonkey do not block links to the (1) about:plugins and (2) about:config URIs from .desktop files, which allows user-assisted remote attackers to bypass the Same Origin Policy and execute arbitrary code with chrome privileges via vectors involving the URL field in a Desktop Entry section of a .desktop file, related to representation of about: URIs as jar:file:// URIs. NOTE: this issue exists because of an incomplete fix for CVE-2008-4582.

Patch / fix

  • firefox RHEL 4 3.0.6-1.el4
  • firefox RHEL 5 3.0.6-1.el5
  • nss RHEL 4 3.12.2.0-3.el4
  • nss RHEL 5 3.12.2.0-4.el5
  • nss-tools RHEL 4 3.12.2.0-3.el4
  • nss-tools RHEL 5 3.12.2.0-4.el5
  • xulrunner RHEL 5 1.9.0.6-1.el5
  • xulrunner-devel-unstable RHEL 5 1.9.0.6-1.el5

red hat advisories RHSA-2009:0256

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-0356 updated cvss 5.1

Firefox Chrome privilege escalation via local .desktop files

  • Red Hat Enterprise Linux (v. 5 server) nss 3.12.2.0-4.el5, firefox 3.0.6-1.el5, xulrunner 1.9.0.6-1.el5, nss-tools 3.12.2.0-4.el5, xulrunner-devel-unstable 1.9.0.6-1.el5 Red Hat Enterprise Linux AS version 4 nss 3.12.2.0-3.el4, firefox 3.0.6-1.el4, nss-tools 3.12.2.0-3.el4 Red Hat Enterprise Linux Desktop (v. 5 client) nss 3.12.2.0-4.el5, firefox 3.0.6-1.el5, xulrunner 1.9.0.6-1.el5, nss-tools 3.12.2.0-4.el5, xulrunner-devel-unstable 1.9.0.6-1.el5 Red Hat Enterprise Linux Desktop version 4 nss 3.12.2.0-3.el4, firefox 3.0.6-1.el4, nss-tools 3.12.2.0-3.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nss 3.12.2.0-4.el5, xulrunner 1.9.0.6-1.el5, nss-tools 3.12.2.0-4.el5, xulrunner-devel-unstable 1.9.0.6-1.el5 Red Hat Enterprise Linux ES version 4 nss 3.12.2.0-3.el4, firefox 3.0.6-1.el4, nss-tools 3.12.2.0-3.el4
    +1 more products
    Red Hat Enterprise Linux WS version 4 nss 3.12.2.0-3.el4, firefox 3.0.6-1.el4, nss-tools 3.12.2.0-3.el4
    fixed: vendor fix RHSA-2009:0256

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.23% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.1 AV:N/AC:H/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.