The msn_slp_sip_recv function in libpurple/protocols/msn/slp.c in the
MSN protocol plugin in libpurple in Pidgin before 2.6.2 allows remote
attackers to cause a denial of service (NULL pointer dereference and
application crash) via an SLP invite message that lacks certain
required fields, as demonstrated by a malformed message from a KMess
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