Bug 1760445 (CVE-2018-16300)

Summary:	CVE-2018-16300 tcpdump: Resource exhaustion in bgp_attr_print() function in print-bgp.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	luhliari, mlichvar, mruprich, msehnout, msekleta, thozza
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	tcpdump 4.9.3	Doc Type:	If docs needed, set a value
Doc Text:	An uncontrolled resource consumption flaw was discovered in the way tcpdump prints BGP packets. The BGP protocol allows ATTR_SET to be nested as many times as the message can accommodate, however when a specially crafted packet is crafted and parsed by tcpdump, this may lead to stack exhaustion due to uncontrolled recursion. System availability is the highest threat from this vulnerability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 02:21:49 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:	1760626, 1791699, 1791700
Bug Blocks:	1760628

Description Pedro Sampaio 2019-10-10 14:51:17 UTC

The BGP parser in tcpdump before 4.9.3 allows stack consumption in print-bgp.c:bgp_attr_print() because of unlimited recursion.

Upstream patch:

https://github.com/the-tcpdump-group/tcpdump/commit/af2cf04a9394c1a56227c2289ae8da262828294a

References:

https://github.com/the-tcpdump-group/tcpdump/blob/tcpdump-4.9/CHANGES

Comment 1 Pedro Sampaio 2019-10-11 00:02:32 UTC

Created tcpdump tracking bugs for this issue:

Affects: fedora-all [bug 1760626]

Comment 3 Product Security DevOps Team 2020-11-04 02:21:49 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2018-16300

Comment 4 errata-xmlrpc 2020-11-04 03:40:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4760 https://access.redhat.com/errata/RHSA-2020:4760