Bug 750631 (CVE-2011-4093) - CVE-2011-4093 net6: integer overflow may lead to connection hijacking
Summary: CVE-2011-4093 net6: integer overflow may lead to connection hijacking
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2011-4093
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: 750633 750634
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-11-01 20:21 UTC by Vincent Danen
Modified: 2021-10-19 21:50 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-10-19 21:50:46 UTC

Attachments (Terms of Use)

Description Vincent Danen 2011-11-01 20:21:21 UTC 
Vasiliy Kulikov reported [1] that libnet6 did not check the basic_server::id_counter for integer overflows.  This number is used to distinguish different users, so an attacker that was able to open UINT_MAX successive connections could get an identifier of an already existing connection, allowing them to hijack that user's connection.

Note that, as reported, on i686 uint is a 32 bit counter, so an attacker would need to open 4,000,000,000 connections in order to complete the attack.

This has been corrected in git [2].

[1] http://www.openwall.com/lists/oss-security/2011/10/30/3
[2] http://git.0x539.de/?p=net6.git;a=commitdiff;h=ac61d7fb42a1f977fb527e024bede319c4a9e169;hp=08c8e2261604c6fcbbaf62f9ae9d13f7015fcb9a
Comment 1 Vincent Danen 2011-11-01 20:26:19 UTC 
Created net6 tracking bugs for this issue

Affects: fedora-all [bug 750633]
Affects: epel-all [bug 750634]
Comment 2 Fedora Update System 2011-11-25 02:04:46 UTC 
net6-1.3.14-1.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 3 Fedora Update System 2011-11-25 02:04:51 UTC 
net6-1.3.14-1.el5 has been pushed to the Fedora EPEL 5 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 4 Fedora Update System 2011-11-25 02:06:34 UTC 
net6-1.3.14-1.el6 has been pushed to the Fedora EPEL 6 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 5 Fedora Update System 2011-11-25 02:12:23 UTC 
net6-1.3.14-1.fc14 has been pushed to the Fedora 14 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2011-11-25 02:16:47 UTC 
net6-1.3.14-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.
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