Bug 849949 (CVE-2012-3517, CVE-2012-3518, CVE-2012-3519) - CVE-2012-3517 tor: Read from freed memory and double free by processing failed DNS request
Summary: CVE-2012-3517 tor: Read from freed memory and double free by processing faile...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: CVE-2012-3517, CVE-2012-3518, CVE-2012-3519
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 849952
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-08-21 10:00 UTC by Jan Lieskovsky
Modified: 2019-09-29 12:55 UTC (History)
4 users (show)

Fixed In Version: tor 0.2.2.38
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-05-31 03:08:16 UTC


Attachments (Terms of Use)

Description Jan Lieskovsky 2012-08-21 10:00:45 UTC
A read from already freed memory and double free flaws were found in the way Tor, a connection-based low-latency anonymous communication system, performed processing of certain failing DNS requests. A remote attacker could issue a specially-crafted DNS request that, when processed would lead to tor executable crash.

Upstream ticket:
[1] https://trac.torproject.org/projects/tor/ticket/6480

Relevant patch:
[2] https://gitweb.torproject.org/tor.git/commitdiff/62637fa22405278758febb1743da9af562524d4c

References:
[3] https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html
[4] https://bugzilla.novell.com/show_bug.cgi?id=776642

Comment 1 Jan Lieskovsky 2012-08-21 10:03:18 UTC
This issue affects the version of the tor package, as shipped with Fedora EPEL 5. Please schedule an update.

--

Tor package versions, shipped in Fedora 16 and Fedora 17 got already updated to upstream 0.2.2.38 version.

Comment 2 Jan Lieskovsky 2012-08-21 10:04:14 UTC
Created tor tracking bugs for this issue

Affects: epel-5 [bug 849952]

Comment 3 Jan Lieskovsky 2012-08-21 10:13:47 UTC
For the other two issues corrected within 0.2.2.38 version:
https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html

2) tor: Unitialized memory read by reading vote or consensus document with unrecognized flavor name
---------------------------------------------------------------------------
Upstream ticket:
[5] https://trac.torproject.org/projects/tor/ticket/6530

Relevant patches:
[6] https://gitweb.torproject.org/tor.git/commitdiff/57e35ad3d91724882c345ac709666a551a977f0f
[7] https://gitweb.torproject.org/tor.git/commitdiff/55f635745afacefffdaafc72cc176ca7ab817546

References:
[8] https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html
[9] https://bugzilla.novell.com/show_bug.cgi?id=776642

and

3) tor: Client's relays path information leak
---------------------------------------------
Upstream ticket:
[10] https://trac.torproject.org/projects/tor/ticket/6537

Relevant patches:
[11] https://gitweb.torproject.org/tor.git/commitdiff/308f6dad20675c42b29862f4269ad1fbfb00dc9a
[12] https://gitweb.torproject.org/tor.git/commitdiff/d48cebc5e498b0ae673635f40fc57cdddab45d5b

References:
[13] https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html
[14] https://bugzilla.novell.com/show_bug.cgi?id=776642

Relevant patches are not applicable to the source code base for tor package version, as shipped with Fedora EPEL 5 yet (it is not affected by 2) and 3) flaws). The 2) and 3) flaws are also already corrected in Fedora 16 and Fedora 17 tor package versions.

Comment 4 Jan Lieskovsky 2012-08-21 10:14:31 UTC
CVE request:
http://www.openwall.com/lists/oss-security/2012/08/21/3

Comment 6 Kurt Seifried 2012-08-27 01:48:19 UTC
Added additional CVEs

http://www.openwall.com/lists/oss-security/2012/08/21/6

Comment 7 Fedora Update System 2012-09-24 03:21:23 UTC
tor-0.2.2.39-1800.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2013-02-03 13:38:43 UTC
tor-0.2.2.39-1700.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.


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