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Bug #4298

closed

ssl : Integer underflow in ssl parsing SSLV3_HANDSHAKE_PROTOCOL

Added by Jeff Lucovsky over 3 years ago. Updated over 3 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Victor Julien
Target version:
6.0.2
Affected Versions:
Effort:
Difficulty:
Label:

Description

Found by oss-fuzz
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28399

First we being parsing SSLV3_HANDSHAKE_PROTOCOL
We set message_start, bytes_processed and message_length in SSLv3ParseHandshakeProtocol

Then, we break out of this SSLV3_HANDSHAKE_PROTOCOL parsing because the other side of the connexion set SSL_AL_FLAG_CHANGE_CIPHER_SPEC
This leads to increasing bytes_processed at the end of SSLv3Decode

Then, we do not break anymore out of this SSLV3_HANDSHAKE_PROTOCOL parsing because the other side set SSL_AL_FLAG_STATE_CLIENT_HELLO
And bytes_processed is now over message_start + message_length

Related issues 1 (0 open — 1 closed)

Copied from Suricata - Bug #4233: ssl : Integer underflow in ssl parsing SSLV3_HANDSHAKE_PROTOCOLClosedPhilippe AntoineActions
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