Dell BIOS in some Latitude laptops and Precision Mobile Workstations vulnerable to buffer overflow
Overview
Dell BIOS in some older Latitude laptops and Precision Mobile Workstations are vulnerable to buffer overflows (CWE-119), which can bypass the signed BIOS enforcement standard.Description
| CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer Dell BIOS in some older Latitude laptops and Precision Mobile Workstations is vulnerable to buffer overflows in the rbu_packet.pktNum and rbu_packet.pktSize values. These values can be set by an attacker while performing an illegitimate BIOS update. The BIOS reads these values when reconstructing the BIOS image, before any signature check occurs. More information is available from the BIOS Security presentation at Black Hat USA 2013. |
Impact
| By convincing a user with root or administrative privileges to execute a malicious BIOS update, an attacker can bypass the signed BIOS enforcement to install an arbitrary BIOS image that could contain a rootkit or malicious code that persists across operating system re-installations and official BIOS updates. |
Solution
| Apply an Update Dell has released updated BIOS versions for the affected Latitude and Precision systems that can be downloaded from their support site. Dell has provided the following list of fixed BIOS versions: Dell System Released Rev =================================================== Latitude D530 8/22/2013 A12 Latitude D531 7/16/2013 A12 Latitude D630 7/16/2013 A19 Latitude D631 7/26/2013 A12 Latitude D830 7/16/2013 A17 Precision M2300 7/16/2013 A11 Precision M4300 7/16/2013 A17 Precision M6300 7/16/2013 A15 Latitude E5400 7/16/2013 A19 Latitude E5500 7/16/2013 A19 Latitude E4200 7/16/2013 A24 Latitude E4300 7/16/2013 A26 Latitude E6400 7/16/2013 A34 Latitude E6400 ATG 7/16/2013 A34 Latitude E6400 / ATG / XFR 7/16/2013 A34 Latitude XT2 7/18/2013 A15 Latitude E6500 7/16/2013 A29 Latitude Z600 7/16/2013 A11 Precision M2400 7/16/2013 A28 Precision M4400 7/16/2013 A29 Precision M6400 7/16/2013 A13 Precision M6500 7/18/2013 A10 |
Vendor Information (Learn More)
| Vendor | Status | Date Notified | Date Updated |
|---|---|---|---|
| Dell Computer Corporation, Inc. | Affected | 11 Jul 2013 | 22 Aug 2013 |
CVSS Metrics (Learn More)
| Group | Score | Vector |
|---|---|---|
| Base | 6.2 | AV:L/AC:H/Au:N/C:C/I:C/A:C |
| Temporal | 4.9 | E:POC/RL:OF/RC:C |
| Environmental | 3.7 | CDP:ND/TD:M/CR:ND/IR:ND/AR:ND |
References
- https://www.blackhat.com/us-13/archives.html#Butterworth
- http://www.mitre.org/work/cybersecurity/blog/cyber_tools_butterworth.html
- http://support.dell.com/
Credit
Thanks to Corey Kallenberg, John Butterworth, and Xeno Kovah of the MITRE Corporation for reporting this vulnerability. Thanks also to Rick Martinez from Dell.This document was written by Adam Rauf.
Other Information
- CVE IDs: CVE-2013-3582
- Date Public: 15 Aug 2013
- Date First Published: 15 Aug 2013
- Date Last Updated: 22 Aug 2013
- Document Revision: 54
- wong chee tat :)
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