Bug 1377361 – CVE-2016-7415 icu: Stack based buffer overflow in locid.cpp

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Bug 1377361 - (CVE-2016-7415) CVE-2016-7415 icu: Stack based buffer overflow in locid.cpp

Summary:	CVE-2016-7415 icu: Stack based buffer overflow in locid.cpp

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-7415

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20160903,repor...
Keywords:	Security

Depends On:	1377363 1377364 1377362
Blocks:	1360344
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Reported:	2016-09-19 09:30 EDT by Adam Mariš
Modified:	2016-11-29 22:50 EST (History)
CC List:	18 users (show)

See Also:
Fixed In Version:	icu 58.1
Doc Type:	If docs needed, set a value
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Environment:
Last Closed:	2016-11-29 22:50:33 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2016-09-19 09:30:18 EDT

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 09:31:23 EDT

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 09:31:36 EDT

Created icu tracking bugs for this issue:

Affects: fedora-all [bug 1377362]

Comment 3 Doran Moppert 2016-09-29 00:06:40 EDT

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 04:36:45 EDT

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

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

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