A use-after-free flaw was found in the code responsible for processing packages from Q.931 protocol, in wireshark. An attacker can send specially crafted packages over the network which, when received, would cause an application to crash, or potentially, corrupt information.
A flaw was found in Wireshark 2.6.0, 2.4.0 to 2.4.6, and 2.2.0 to 2.2.14, the Q.931 dissector could crash. It may be possible to make Wireshark crash by injecting a malformed packet onto the wire or by convincing someone to read a malformed packet trace file. This was addressed in epan/dissectors/packet-q931.c by avoiding a use-after-free after a malformed packet prevented certain cleanup.
Created wireshark tracking bugs for this issue:
Affects: fedora-all [bug 1581754]