Bug 1113899 (CVE-2014-4608)

Summary:	CVE-2014-4608 kernel: lzo1x_decompress_safe() integer overflow
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	anton, aquini, bhu, dhoward, fhrbata, fweimer, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, npajkovs, plougher, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	An integer overflow flaw was found in the way the lzo1x_decompress_safe() function of the Linux kernel's LZO implementation processed Literal Runs. A local attacker could, in extremely rare cases, use this flaw to crash the system or, potentially, escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:33:42 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:	1113900, 1113901, 1113902, 1113903, 1113904, 1113905
Bug Blocks:	1112414

Description Petr Matousek 2014-06-27 07:34:50 UTC

An integer overflow can occur when processing any variant of a "literal run"
in the lzo1x_decompress_safe function. Each of these three locations is
subject to an integer overflow when processing zero bytes.

This exposes the code that copies literals to memory corruption. An
interesting side effect of the vulnerable code is that the value of 'op'
can point to a region of memory just before the start of 'out'.

It should be noted that on 64bit architectures, the overflow is still
possible, but impractical. An overflow would require so much input data that
an attack would obviously be infeasible even on modern computers.

Upstream patch:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=206a81c18401c0cde6e579164f752c4b147324ce

References:
http://seclists.org/oss-sec/2014/q2/666

Acknowledgements:

Red Hat would like to thank Don A. Bailey from Lab Mouse Security for reporting this issue.

Comment 3 Petr Matousek 2014-06-27 07:38:50 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1113905]

Comment 4 Petr Matousek 2014-06-27 07:40:29 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5.

Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2 only support 64-bit architectures. Since exploiting this issue on 64-bit platforms is not feasible given the amount of input data that is necessary to trigger the integer overflow, we are currently not planning planning to fix this issue in Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2.

Comment 5 Fedora Update System 2014-06-30 10:28:52 UTC

kernel-3.14.9-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Tomas Hoger 2014-06-30 14:52:52 UTC

Blog post and security report from the original reporter:

http://blog.securitymouse.com/2014/06/raising-lazarus-20-year-old-bug-that.html
https://www.securitymouse.com/lms-2014-06-16-2

Comment 8 Fedora Update System 2014-07-25 10:08:31 UTC

kernel-3.14.13-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Martin Prpič 2014-10-10 08:45:51 UTC

IssueDescription:

An integer overflow flaw was found in the way the lzo1x_decompress_safe() function of the Linux kernel's LZO implementation processed Literal Runs. A local attacker could, in extremely rare cases, use this flaw to crash the system or, potentially, escalate their privileges on the system.

Comment 10 errata-xmlrpc 2014-10-14 06:16:13 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:1392 https://rhn.redhat.com/errata/RHSA-2014-1392.html

Comment 12 errata-xmlrpc 2015-01-20 17:22:33 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 EUS - Server and Compute Node Only

Via RHSA-2015:0062 https://rhn.redhat.com/errata/RHSA-2015-0062.html