Advisory Details

November 24th, 2013

Valve Steam User Chat Message Remote Code Execution Vulnerability

ZDI-13-269
ZDI-CAN-1975

CVE ID
CVSS SCORE 6.5, (AV:N/AC:L/Au:S/C:P/I:P/A:P)
AFFECTED VENDORS Valve
AFFECTED PRODUCTS Steam
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Valve Steam. No action is necessary on the part of the vulnerable Steam user other than signing on to the Steam service.

The specific flaw exists within the handling of user to user messages in the Steam client. An attacker can exploit this vulnerability by sending a malformed message to another Steam user via the Steam service. This can result in arbitrary code execution in the context of the Steam client.

VENDOR RESPONSE Valve has issued an update to correct this vulnerability. More details can be found at:
http://store.steampowered.com/news/11750/
DISCLOSURE TIMELINE
  • 2013-09-16 - Vulnerability reported to vendor
  • 2013-11-24 - Coordinated public release of advisory
CREDIT Arnaud Dovi
ad@heapoverflow.com
http://goo.gl/Fgry8j
BACK TO ADVISORIES