Bug 1451382 (CVE-2017-8929)

Summary:	CVE-2017-8929 yara: Use-after-free in sized_string_cmp function
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rebus
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-09-23 20:34:04 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1451383, 1451384
Bug Blocks:

Description Andrej Nemec 2017-05-16 14:26:24 UTC

The sized_string_cmp function in libyara/sizedstr.c in YARA 3.5.0 allows attackers to cause a denial of service (use-after-free and application crash) via a crafted rule.

Upstream issue:

https://github.com/VirusTotal/yara/issues/658

Upstream patch:

https://github.com/VirusTotal/yara/commit/053e67e3ec81cc9268ce30eaf0d6663d8639ed1e

Comment 1 Andrej Nemec 2017-05-16 14:26:57 UTC

Created yara tracking bugs for this issue:

Affects: epel-all [bug 1451383]
Affects: fedora-all [bug 1451384]

Comment 2 Michal Ambroz 2018-09-23 20:34:04 UTC

Fixed in yara-3.6.0-1.fc26 yara-3.6.0-1.el7 yara-3.6.0-1.fc24 yara-3.6.0-1.fc25