Bug 750631 (CVE-2011-4093)

Summary:	CVE-2011-4093 net6: integer overflow may lead to connection hijacking
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	pfrields
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-19 21:50:46 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	750633, 750634
Bug Blocks:

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.