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6.2

Firefox, Thunderbird, SeaMonkey updater may let local users gain rights

CVE-2013-1726 · published 13 years ago
Summary

Older versions of Firefox, Thunderbird (including ESR) and SeaMonkey do not lock the update file while checking its signature, so a local user could replace the file with a malicious one after the check but before it is used. This could let that user run code with the program's privileges. Upgrade to the latest releases or apply the vendor's security patch to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
mozilla thunderbird_esr 17.0
17.0.1
17.0.2
17.0.3
17.0.4
17.0.5
17.0.6
17.0.7
17.0.8
cpe:2.3:a:mozilla:thunderbird_esr:17.0:*:*:*:*:*:*:*
mozilla thunderbird <= 17.0.9
17.0
17.0.1
17.0.2
17.0.3
17.0.4
17.0.5
17.0.6
17.0.7
17.0.8
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
mozilla firefox <= 23.0.1
19.0
19.0.1
19.0.2
20.0
20.0.1
21.0
22.0
23.0
17.0
17.0.1
17.0.2
6 more version ranges
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla seamonkey <= 2.20
2.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.0.10
24 more version ranges
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
Original advisory text
Mozilla Updater in Mozilla Firefox before 24.0, Firefox ESR 17.x before 17.0.9, Thunderbird before 24.0, Thunderbird ESR 17.x before 17.0.9, and SeaMonkey before 2.21 does not ensure exclusive acce...
Mozilla Updater in Mozilla Firefox before 24.0, Firefox ESR 17.x before 17.0.9, Thunderbird before 24.0, Thunderbird ESR 17.x before 17.0.9, and SeaMonkey before 2.21 does not ensure exclusive access to a MAR file, which allows local users to gain privileges by creating a Trojan horse file after MAR signature verification but before MAR use.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
6.2 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-264Permissions, Privileges, and Access Controls
Timeline
Published18 Sep 2013
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2013-1726 · NVD
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