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Date: Sat, 24 Jan 2015 18:29:04 +0100
From: Gerhard Rieger <gerhard@...t-unreach.org>
To: oss-security@...ts.openwall.com
Subject: Socat security advisory 6 - Possible DoS with fork
Socat security advisory 6 - Possible DoS with fork
Overview
socats signal handler implementations are not async-signal-safe and
can cause crash or freeze of socat processes
Vulnerability Id: (pending)
Severity: Low
Details
Socats signal handler implementations are not asnyc-signal-safe. When
a signal is triggered while the process is within a non
async-signal-safe function the signal handler will call a non
sync-signal-safe function too. POSIX specifies the behaviour in this
situation as undefined. Dependend on involved functions, libraries,
and operating system, the process can continue, freeze, or crash.
Mostly this issue occurs when socat is in listening mode with fork
option and a couple of child processes terminate at the same time.
Testcase
none
Affected versions
1.0.0.0 - 1.7.2.4
2.0.0-b1 - 2.0.0-b7
Not affected or corrected versions
1.7.3.0 and later
2.0.0-b8 (to be released) and later
Workaround
none
Download
The updated sources can be downloaded from:
http://www.dest-unreach.org/socat/download/socat-1.7.3.0.tar.gz
Credits
Credits to Peter Lobsinger
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