Vulnerability Note VU#964549
Mozilla WOFF decoder integer overflow
OverviewAn integer overflow in the Mozilla Web Open Fonts Format (WOFF) decoder may allow a remote attacker to execute code on an affected system.
I. DescriptionThe Web Open Fonts Format (WOFF) is a simple compressed file format for fonts. Mozilla introduced support for WOFF in the 1.9.2 branch of the base software, which is used by Firefox versions 3.6 and later.
An integer overflow error exists in the way the WOFF decoder handles the size of tables specified in the font file. This error could result in a buffer overflow vulnerability on a subsequent memory allocation. A remote attacker who is able to supply a malicious WOFF file could exploit this vulnerability.
II. ImpactA remote, unauthenticated attack may be able to execute arbitrary code with the privileges of the victim user.
III. SolutionUpgrade
Mozilla has addressed this issue in Firefox version 3.6.2. Users are encouraged to upgrade to this version of the browser.
Disable downloading of remote fonts
By performing the following steps, it is possible to prevent Mozilla from retrieving and displaying remote fonts.
- Enter "about:config" into the browser's address bar. This will display Firefox's configuration values.
- Set the following value to false:
gfx.downloadable_fonts.enabled
Systems Affected
Any Mozilla-derived product that uses the Mozilla 1.9.2 code could be affected.
| Vendor | Status | Date Notified | Date Updated |
|---|
| Mozilla | Vulnerable | 2010-02-19 | 2010-03-23 |
References
http://www.theregister.co.uk/2010/02/18/firefox_zero_day_report/
http://blog.mozilla.com/security/2010/03/18/update-on-secunia-advisory-sa38608/
http://secunia.com/advisories/38608/
http://people.mozilla.com/~jkew/woff/woff-spec-latest.html
http://hacks.mozilla.org/2009/10/woff/
https://bugzilla.mozilla.org/show_bug.cgi?id=552216
Credit
This vulnerability was reported to Mozilla by Evgeny Legerov of Intevydis.
This document was written by Chad R Dougherty.
Other Information
| Date Public: | 2010-03-17 |
| Date First Published: | 2010-03-23 |
| Date Last Updated: | 2010-07-28 |
| CERT Advisory: | |
| CVE-ID(s): | CVE-2010-1028 |
| NVD-ID(s): | CVE-2010-1028 |
| US-CERT Technical Alerts: | |
| Metric: | 16.87 |
| Document Revision: | 17 |
If you have feedback, comments, or additional information about this vulnerability, please send us
email.
|
