Bug 723846 (CVE-2018-0739)

Summary:	[Tracker] ASN.1 parsing vulnerability (CVE-2018-0739)
Product:	Gentoo Security	Reporter:	Sam James <sam>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:	A3 [cve]
Package list:		Runtime testing required:	---
Bug Depends on:	651730, 723848
Bug Blocks:

Description Sam James archtester

2020-05-18 21:30:59 UTC

Constructed ASN.1 types with a recursive definition could exceed the stack (CVE-2018-0739)
==========================================================================================

Severity: Moderate

Constructed ASN.1 types with a recursive definition (such as can be found in
PKCS7) could eventually exceed the stack given malicious input with
excessive recursion. This could result in a Denial Of Service attack. There are
no such structures used within SSL/TLS that come from untrusted sources so this
is considered safe.

OpenSSL 1.1.0 users should upgrade to 1.1.0h
OpenSSL 1.0.2 users should upgrade to 1.0.2o

This issue was reported to OpenSSL on 4th January 2018 by the OSS-fuzz project.
The fix was developed by Matt Caswell of the OpenSSL development team.

Comment 1 Sam James archtester

2020-05-18 21:37:58 UTC

Please note that this is *not* a new issue in OpenSSL; this tracker is so we can use the CVE for libtomcrypt / dropbear too.