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Vulnerability Note VU#371382Gaim fails to properly validate the "name" parameter in the Yahoo login webpageOverviewThere is a buffer overflow vulnerability in the way the Gaim yahoo_login_page_hash() function parses the "name" parameter in the Yahoo login webpage.I. DescriptionGaim is a multi-protocol instant messenger available for a number of operating systems. It supports a variety of instant messaging protocols, including the Yahoo Messenger (YMSG) protocol. There is a buffer overflow vulnerability in the yahoo_login_page_hash() function of Gaim's YMSG protocol. When parsing the Yahoo login webpage, the yahoo_login_page_hash() function fails to perform adequate bounds checking on the value of the "name" parameter. Although the source of this value should originate from a site controlled by Yahoo, an attacker may use several techniques (DNS spoofing, man-in-the-middle, etc.) to modify the values returned to the victim.II. ImpactAn attacker with the ability to control the "name" parameter returned to the victim could execute arbitrary code with the privileges of the vulnerable process.III. SolutionUpgradeUpgrade to Gaim version 0.76 or later.
References
This vulnerability was publicly reported by Stefan Esser of e-matters. This document was written by Damon Morda.
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