Bug 1377361 (CVE-2016-7415)

Summary:	CVE-2016-7415 icu: Stack based buffer overflow in locid.cpp
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, caolanm, denis.arnaud_fedora, dmcphers, dmoppert, dsirrine, erack, erik-fedora, jialiu, jokerman, kseifried, lmeyer, mfabian, mmccomas, rmeggins, slawomir, tiwillia, tuxator
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	icu 58.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-30 03:50:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1377362, 1377363, 1377364
Bug Blocks:	1360344

Description Adam Mariš 2016-09-19 13:30:18 UTC

It was found that big locale string causes stack based overflow inside libicu.

PHP bug:

https://bugs.php.net/bug.php?id=73007

CVE assignment:

http://seclists.org/oss-sec/2016/q3/518

Comment 1 Adam Mariš 2016-09-19 13:31:23 UTC

Created mingw-icu tracking bugs for this issue:

Affects: fedora-all [bug 1377363]
Affects: epel-7 [bug 1377364]

Comment 2 Adam Mariš 2016-09-19 13:31:36 UTC

Created icu tracking bugs for this issue:

Affects: fedora-all [bug 1377362]

Comment 3 Doran Moppert 2016-09-29 04:06:40 UTC

If there is an upstream icu bug, it is still private.  I have attempted to repro on rhel-7.2 based on variants of the PHP function, but no success so far.

PHP upstream crash report shows a stack overflow in Locale::Locale(char*).  RHEL builds icu with -fstack-protector, which prevents traditional code execution vectors through stack smashing.  I don't see any dangerous adjacent stack contents in that constructor, so the impact here is limited to a crash.

Comment 5 Doran Moppert 2016-11-04 08:36:45 UTC

Upstream bug (ICU) (private as at 2016-11-04):

http://bugs.icu-project.org/trac/ticket/12745