Title: Yahoo Instant Messenger Signed Content Weakness
Severity: HIGH
Description:
Yahoo Instant Messenger is an instant messenger client distributed by Yahoo. It is available for Microsoft Windows sytems.
A weakness has been reported in the Yahoo Instant Messenger installer where an attacker may use the installer to install malicious software on the vulnerable system. The Yahoo Instant Messenger Installer uses HTTP, and though it uses signed content for the installer, does not verify the signature of packages downloaded from Yahoo.
In order to exploit this weakness, the attacker must control the machine located at a19.g.a.yimg.com, from the perspective of the vulnerable client. It may be possible to create this condition through some known techniques, including DNS cache poisoning and DNS spoofing.
Affected Products:
- Yahoo! Messenger 4.0.0
- Yahoo! Messenger 5.0.0
- Yahoo! Messenger 5.5.0
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