Bug 1661518 (CVE-2018-5808)

Summary:	CVE-2018-5808 LibRaw: stack-based buffer overflow in find_green() leads to arbitrary code execution
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	debarshir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	LibRaw 0.18.9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-01-03 09:15:29 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:	1661519
Bug Blocks:	1661524

Description Laura Pardo 2018-12-21 12:57:23 UTC

A flaw was found in LibRaw versions prior to 0.18.9. An error within the "find_green()" function (internal/dcraw_common.cpp) can be exploited to cause a stack-based buffer overflow and subsequently execute arbitrary code. 


References:
https://github.com/LibRaw/LibRaw/blob/master/Changelog.txt 
https://secuniaresearch.flexerasoftware.com/advisories/81800/ 
https://secuniaresearch.flexerasoftware.com/secunia_research/2018-9/

Upstream commit:
https://github.com/LibRaw/LibRaw/commit/fd6330292501983ac75fe4162275794b18445bd9

Comment 1 Laura Pardo 2018-12-21 12:57:33 UTC

Created LibRaw tracking bugs for this issue:

Affects: epel-6 [bug 1661519]

Comment 2 Riccardo Schirone 2019-01-03 09:03:54 UTC

Increase Impact of the flaw to Important and set C:H/I:H/A:H because arbitrary code execution may be possible on affected versions.

Comment 3 Riccardo Schirone 2019-01-03 09:08:51 UTC

RHEL 7 is not affected by this flaw because the attacker does not have control over the width field as find_green() function is always called after hardcoding values in width/height fields that are less then 2064.

Comment 4 Riccardo Schirone 2019-01-03 09:12:14 UTC

On the affected versions, function find_green() in internal/dcraw_common.cpp does not correctly check the "width" value, which is used to read/write from/to an array of 2064 elements. By providing a specially crafted image that is able to reach the find_green() function with a width greater than 2064, an attacker could overwrite data on the stack and execute arbitrary code.

Comment 5 Riccardo Schirone 2019-01-03 09:15:05 UTC

Statement:

This issue did not affect the versions of LibRaw as shipped with Red Hat Enterprise Linux 7 as it does not allow an attacker enough control to corrupt the internal state.