Bug 1660397 (CVE-2018-19974, CVE-2018-19975, CVE-2018-19976)

Summary:	CVE-2018-19974 CVE-2018-19975 CVE-2018-19976 yara: Multiple issues
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
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:	2019-06-10 10:44:06 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:	1660398, 1660399
Bug Blocks:

Description Andrej Nemec 2018-12-18 09:32:12 UTC

CVE-2018-19974

In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).

https://github.com/VirusTotal/yara/issues/999

CVE-2018-19975

In YARA 3.8.1, bytecode in a specially crafted compiled rule can read data from any arbitrary address in memory, in libyara/exec.c. Specifically, OP_COUNT can read a DWORD.

https://github.com/VirusTotal/yara/issues/999

CVE-2018-19976

In YARA 3.8.1, bytecode in a specially crafted compiled rule is exposed to information about its environment, in libyara/exec.c. This is a consequence of the design of the YARA virtual machine.

https://bnbdr.github.io/posts/extracheese/
https://github.com/bnbdr/swisscheese/
https://github.com/VirusTotal/yara/issues/999

Comment 1 Andrej Nemec 2018-12-18 09:32:24 UTC

Created yara tracking bugs for this issue:

Affects: epel-all [bug 1660399]
Affects: fedora-all [bug 1660398]

Comment 2 Product Security DevOps Team 2019-06-10 10:44:06 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.