fd_set -- bitmap index overflow in multiple applications

Description:

3APA3A reports:

If programmer fails to check socket number before using select() or fd_set macros, it's possible to overwrite memory behind fd_set structure. Very few select() based application actually check FD_SETSIZE value. [...]

Depending on vulnerable application it's possible to overwrite portions of memory. Impact is close to off-by-one overflows, code execution doesn't seems exploitable.

References:

• URL: <http://www.gotbnc.com/changes.html#2.9.3>
• URL: <http://www.security.nnov.ru/advisories/sockets.asp>
• List post: <http://marc.theaimsgroup.com/?l=bugtraq&m=110660879328901>(search)

Affects:

• gatekeeper <2.2.1
• citadel <6.29
• 3proxy <0.5.b
• jabber <1.4.3.1_1,1
• jabber =1.4.4
• bnc <2.9.3
• rinetd <0.62_1
• dante <1.1.15
• bld <0.3.3

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