Bug #4298: ssl : Integer underflow in ssl parsing SSLV3_HANDSHAKE_PROTOCOL - Suricata - Open Information Security Foundation

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Bug #4298

closed

ssl : Integer underflow in ssl parsing SSLV3_HANDSHAKE_PROTOCOL

Added by Jeff Lucovsky almost 4 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)