Bug 916075 - (CVE-2013-1772) CVE-2013-1772 kernel: call_console_drivers() function log prefix stripping DoS
CVE-2013-1772 kernel: call_console_drivers() function log prefix stripping DoS
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On: 916079
Blocks: 916097
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Reported: 2013-02-27 03:40 EST by Petr Matousek
Modified: 2018-02-07 18:00 EST (History)
23 users (show)

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Doc Type: Bug Fix
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Description Petr Matousek 2013-02-27 03:40:38 EST
Description of the problem:
A buffer overrun flaw was found in kernels from 3.0 to 3.4 when calling
log_prefix() function from call_console_drivers().
In log_prefix(), the access to "p[1]", "p[2]" or
"simple_strtoul(&p[1], &endp, 10)" may cause a buffer overflow as this
function is called from call_console_drivers by passing "&LOG_BUF(cur_index)"
where the index must be masked to do not exceed the buffer's boundary.

A local user able to write to /dev/kmsg could use this flaw to crash the

Note: /dev/kmsg is root writable only (at least on RHEL/Fedora), but it
still might cause issues in restricted root environments.

Comment 1 Petr Matousek 2013-02-27 03:44:43 EST

This issue did not affect the versions of kernel package as shipped with Red Hat Enterprise Linux 5 and 6. Future kernel updates for Red Hat Enterprise MRG 2 may address this flaw.
Comment 3 errata-xmlrpc 2013-03-06 14:26:03 EST
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2013:0566 https://rhn.redhat.com/errata/RHSA-2013-0566.html

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