Bug 1332200 – CVE-2016-4425 jansson: stack exhaustion parsing a JSON file

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Bug 1332200 - (CVE-2016-4425) CVE-2016-4425 jansson: stack exhaustion parsing a JSON file

Summary:	CVE-2016-4425 jansson: stack exhaustion parsing a JSON file

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-4425

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:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20160501,repor...
Keywords:	Security

Depends On:	1332201 1332202
Blocks:	1332205
	Show dependency tree / graph

Reported:	2016-05-02 09:30 EDT by Andrej Nemec
Modified:	2016-11-08 11:07 EST (History)
CC List:	6 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-05-12 02:16:51 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
reproduction script + client program (88.83 KB, application/x-gzip) 2016-05-12 02:10 EDT, Doran Moppert	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Andrej Nemec 2016-05-02 09:30:18 EDT

A vulnerability was found in jansson. Parsing a maliciously crafted JSON file could cause the application to crash. This crash is caused by stack exhaustion.

CVE request:

http://seclists.org/oss-sec/2016/q2/181

Upstream bug:

https://github.com/akheron/jansson/issues/282

Upstream patch:

https://github.com/akheron/jansson/pull/284

Comment 1 Andrej Nemec 2016-05-02 09:33:36 EDT

Created jansson tracking bugs for this issue:

Affects: fedora-all [bug 1332201]
Affects: epel-6 [bug 1332202]

Comment 2 Andrej Nemec 2016-05-03 10:11:16 EDT

Upstream fix:

https://github.com/akheron/jansson/pull/284

Comment 3 Doran Moppert 2016-05-12 02:10 EDT

Created attachment 1156436 [details]
reproduction script + client program

Added repro derived from upstream bug.

Comment 4 Doran Moppert 2016-05-12 02:16:51 EDT

RHEL-7 package version 2.4/6el7 confirmed vulnerable by inspecting the source and reproducing the segfault.

The effect is stack overrun: while it segfaults there's no opportunity to exploit it for C/I compromise.  Moderate impact due to affecting availability.

Patch is easy to apply but impact is very low - closing with WONTFIX.

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