family_feedbag.c in the oscar protocol plugin in libpurple in Pidgin before 2.10.1 does not perform the expected UTF-8 validation on message data, which allows remote attackers to cause a denial of service (application crash) via a crafted (1) AIM or (2) ICQ message associated with buddy-list addition.
Credit:
The information has been provided by Evgeny Boger.
When receiving various messages related to requesting or receiving authorization for adding a buddy to a buddy list, the oscar protocol plugin failed to validate that a piece of text was UTF-8. In some cases invalid UTF-8 data would lead to a crash.
Vendor Status:
Pidgin had issued an update for this vulnerability