Bug 651892 (CVE-2010-4160) - CVE-2010-4160 kernel: L2TP send buffer allocation size overflows
Summary: CVE-2010-4160 kernel: L2TP send buffer allocation size overflows
Alias: CVE-2010-4160
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 651893 651894 651895
TreeView+ depends on / blocked
Reported: 2010-11-10 15:14 UTC by Petr Matousek
Modified: 2023-05-11 16:05 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-03-28 08:45:26 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:0007 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2011-01-11 19:44:55 UTC
Red Hat Product Errata RHSA-2011:0330 0 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2011-03-10 20:04:13 UTC

Description Petr Matousek 2010-11-10 15:14:41 UTC
Description of problem:
Both PPPoL2TP (in net/l2tp/l2tp_ppp.c, pppol2tp_sendmsg()) and IPoL2TP (in net/l2tp/l2tp_ip.c, l2tp_ip_sendmsg()) make calls to sock_wmalloc() that perform arithmetic on the size argument without any maximum bound. As a result, by issuing sendto() calls with very large sizes, this allocation size will wrap and result in a small buffer being allocated, leading to ugliness immediately after (probably kernel panics due to bad sk_buff tail position, but possibly kernel heap corruption).



Red Hat would like to thank Dan Rosenberg for reporting this issue.

Comment 2 Petr Matousek 2010-11-10 15:19:53 UTC

The Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and 5 did not
include L2TP functionality, and therefore are not affected by this
issue. This has been addressed in Red Hat Enterprise Linux 6 and Red Hat
Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-0007.html and https://rhn.redhat.com/errata/RHSA-2011-0330.html.

Comment 4 Vincent Danen 2010-11-10 21:53:42 UTC
This issue has been assigned the name CVE-2010-4160.

Comment 8 errata-xmlrpc 2011-01-11 19:45:22 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0007 https://rhn.redhat.com/errata/RHSA-2011-0007.html

Comment 9 errata-xmlrpc 2011-03-10 20:04:23 UTC
This issue has been addressed in following products:

  MRG for RHEL-5

Via RHSA-2011:0330 https://rhn.redhat.com/errata/RHSA-2011-0330.html

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