Multiple buffer overflows in Gaim 0.75 and earlier, and Ultramagnetic before 0.81, allow remote attackers to cause a denial of service and possibly execute arbitrary code via (1) cookies in a Yahoo web connection, (2) a long name parameter in the Yahoo login web page, (3) a long value parameter in the Yahoo login page, (4) a YMSG packet, (5) the URL parser, and (6) HTTP proxy connect.

Buffer overflow in the Extract Info Field Function for (1) MSN and (2) YMSG protocol handlers in Gaim 0.74 and earlier, and Ultramagnetic before 0.81, allows remote attackers to cause a denial of service and possibly execute arbitrary code.

Integer overflow in Gaim 0.74 and earlier, and Ultramagnetic before 0.81, allows remote attackers to cause a denial of service and possibly execute arbitrary code via a directIM packet that triggers a heap-based buffer overflow.