[Bug 1486] New: Improperly used buffer during KEX

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1486

           Summary: Improperly used buffer during KEX
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 5.0p1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Miscellaneous
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: godji at 300penguins.org


In kex.c:kex_input_kexinit, when a packet with the other side's KEX
proposal is received, it is appended into a buffer that has not been
cleared first. This could lead to problems - in particular, if that
buffer already contains an old peer proposal, the new one will be
appended but the old one will be silently used instead.

The code is currently:

    ptr = packet_get_raw(&dlen);
    buffer_append(&kex->peer, ptr, dlen);

but should be:

    ptr = packet_get_raw(&dlen);
    buffer_clear(&kex->peer);
    buffer_append(&kex->peer, ptr, dlen);

-- 
Configure bugmail: https://bugzilla.mindrot.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.