Created attachment 505870 [details] use XDS to decode RPC messages Description of problem: in /usr/include/rpc/rpc_msg.h, elements of struct rpc_msg are defined as u_long, but reference 32 bit values (cf. bug 132802). this means that on systems where u_long is 64 bits, rpc_msg.rm_direction is offset too far into the buffer. in decode_rpc() in rpc.c, dsniff checks whether the rm_direction field is a CALL or a REPLY. if it doesn't match either (likely, since it's checking a completely different part of the message) it calls xdr_getpos() on an uninitialised xdrs. i've attached a patch to work around this, by always using xdr routines directly. the main difference is that it no longer sets the following in REPLY messages: msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; i'm afraid i'm not familiar enough with the inner workings of XDR to know whether this is important. a less intrusive alternative would be to catch the else condition, and just return 0... Version-Release number of selected component (if applicable): dsniff-2.4-0.9.b1.fc14 (affected) dsniff-2.4-0.10.b1.fc15 (affected, patch against this) the Debian Squeeze i386 package, which is not affected. unfortunately i don't have any i386 Fedora boxes to hand to test on. How reproducible: very easy: run dsniff on a 64 bit system, and introduce it to some RPC traffic (either by sniffing, or feeding it a pcap capture file). i can probably supply a suitable capture if necessary. Steps to Reproduce: 1. sudo /usr/sbin/dsniff 2. # wait for some RPC traffic 3. # segfaults in rpc_decode() Actual results: segfault. Expected results: no segfault! :-) Additional info:
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dsniff-2.4-0.17.b1.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/dsniff-2.4-0.17.b1.fc20
dsniff-2.4-0.17.b1.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/dsniff-2.4-0.17.b1.fc19
dsniff-2.4-0.17.b1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/dsniff-2.4-0.17.b1.fc18
dsniff-2.4-0.17.b1.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/dsniff-2.4-0.17.b1.el6
dsniff-2.4-0.17.b1.el5 has been submitted as an update for Fedora EPEL 5. https://admin.fedoraproject.org/updates/dsniff-2.4-0.17.b1.el5
dsniff-2.4-0.17.b1.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.
dsniff-2.4-0.17.b1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
dsniff-2.4-0.17.b1.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
dsniff-2.4-0.17.b1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.
dsniff-2.4-0.17.b1.el5 has been pushed to the Fedora EPEL 5 stable repository. If problems still persist, please make note of it in this bug report.