Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 9512] New: dtls: fix buffer overflow in mac check

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Bug ID	9512
Summary	dtls: fix buffer overflow in mac check
Classification	Unclassified
Product	Wireshark
Version	SVN
Hardware	All
OS	All
Status	UNCONFIRMED
Severity	Critical
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	hauke@hauke-m.de

Created attachment 12237 [details]
dtls: fix buffer overflow in mac check

Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
--
With SHA256 32 bytes and with SHA384 48 bytes are needed for the hash
in dtls_check_mac(), but it only had 20, which was enough for SHA1.
In dtls_check_mac() ssl_hmac_final() is called with a buffer of 20
bytes, but it needed more, which caused a buffer overflow.

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