Bug 850449 - (CVE-2012-3520) CVE-2012-3520 kernel: af_netlink: invalid handling of SCM_CREDENTIALS passing
CVE-2012-3520 kernel: af_netlink: invalid handling of SCM_CREDENTIALS passing
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20120821,repo...
: Security
Depends On: 850685 850687 850688
Blocks: 850459
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Reported: 2012-08-21 11:28 EDT by Petr Matousek
Modified: 2013-08-24 10:11 EDT (History)
10 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-08-24 10:11:11 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2012-08-21 11:28:07 EDT
A flaw was found in the way Netlink messages without explicitly set SCM_CREDENTIALS were delivered. The kernel passes all-zero SCM_CREDENTIALS ancillary data to the receiver if the sender did not provide such data, instead of including the correct data from the peer (as it is the case with AF_UNIX). Programs that set SO_PASSCRED option on the Netlink socket and rely on SCM_CREDENTIALS for authentication might accept spoofed messages and perform privileged actions on behalf of the unprivileged attacker.

Introduced in:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=16e57262

Acknowledgements:

Red Hat would like to thank Pablo Neira Ayuso for reporting this issue.
Comment 1 Petr Matousek 2012-08-21 11:30:14 EDT
Statement:

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6 as they did not backport the commit that introduced this issue. Future kernel updates for Red Hat Enterprise MRG 2 may address this issue.
Comment 6 Petr Matousek 2012-08-22 03:16:48 EDT
Created kernel tracking bugs for this issue

Affects: fedora-all [bug 850688]
Comment 8 errata-xmlrpc 2012-12-04 14:58:56 EST
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2012:1491 https://rhn.redhat.com/errata/RHSA-2012-1491.html

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