Description
Firefox before 1.0.5 and Mozilla before 1.7.9 does not properly clone base objects, which allows remote attackers to execute arbitrary code by navigating the prototype chain to reach a privileged object.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | devhelp +1 | 0.9.2-2.4.6 | RHSA-2005:587 |
| RHEL 4 | firefox +1 | 1.0.6-1.4.1 | RHSA-2005:601, RHSA-2005:586 |
Advisories 9
- RHSA-2005:601 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2005:587 Red Hat Security Advisory: mozilla security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2005:586 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-779-2 mozilla-firefox - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-810-1 mozilla - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-781-1 mozilla-thunderbird - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-779-1 mozilla-firefox - several Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-8-2 mozilla-firefox - several vulnerabilities (update) Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-14-1 mozilla - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-810 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=294795
- SUSE-SR:2005:018 vendor-advisory
- oval:org.mitre.oval:def:11751 vdb-entry signature
- http://www.mozilla.org/security/announce/mfsa2005-56.html
- P-252 third-party-advisory government-resource
- https://bugzilla.mozilla.org/show_bug.cgi?id=295011
- https://bugzilla.mozilla.org/show_bug.cgi?id=294799
- FLSA:160202 vendor-advisory
- oval:org.mitre.oval:def:550 vdb-entry signature
- 19823 third-party-advisory
- oval:org.mitre.oval:def:817 vdb-entry signature
- RHSA-2005:587 vendor-advisory
- 16059 third-party-advisory
- ADV-2005-1075 vdb-entry
- RHSA-2005:601 vendor-advisory
- 1014470 vdb-entry
- SUSE-SA:2005:045 vendor-advisory
- VU#652366 third-party-advisory
- 14242 vdb-entry
- RHSA-2005:586 vendor-advisory
- 16043 third-party-advisory
- SUSE-SA:2006:022 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=296397
- oval:org.mitre.oval:def:100003 vdb-entry signature