Out-of-bounds write with Updater and malicious MAR file

Out-of-bounds write with Updater and malicious MAR file

Announced

August 11, 2015

Reporter

Holger Fuhrmannek

Impact

High

Products

Firefox, Firefox ESR, Firefox OS, SeaMonkey, Thunderbird

Fixed in

• Firefox 40
• Firefox ESR 38.2
• Firefox OS 2.5
• SeaMonkey 2.35
• Thunderbird 38.2

Description

Security researcher Holger Fuhrmannek reported that if the Updater opens a MAR format file with a specially crafted name, an out-of-bounds write will occur. This can lead to a potentially exploitable crash but requires that the malicious MAR format file be present on the local system and the Updater to be run to use it.

References

• Out of bounds write in mar_read.c (CVE-2015-4482)