Bug 1760430 (CVE-2018-14882)

Summary:	CVE-2018-14882 tcpdump: Buffer over-read in function rpl_dio_printopt in print-icmp6.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 out-of-bounds read vulnerability was discovered in tcpdump while printing ICMP6 packets captured in a pcap file or coming from the network. A remote attacker may abuse this flaw by sending specially crafted packets that, when printed, would trigger the flaw and crash the application.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 02:21:47 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:	1760431, 1791697, 1791698
Bug Blocks:	1760628

Description Pedro Sampaio 2019-10-10 14:16:50 UTC

The ICMPv6 parser in tcpdump before 4.9.3 has a buffer over-read in print-icmp6.c.

Upstream patch:

https://github.com/the-tcpdump-group/tcpdump/commit/d7505276842e85bfd067fa21cdb32b8a2dc3c5e4

References:

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

Comment 1 Pedro Sampaio 2019-10-10 14:17:11 UTC

Created tcpdump tracking bugs for this issue:

Affects: fedora-all [bug 1760431]

Comment 2 Riccardo Schirone 2020-01-15 13:50:09 UTC

Function rpl_dio_printopt() in print-icmp6.c may read outside the intended buffer while iterating over the options of a ICMP6 packet. If there are not enough bytes in the captured buffer to fill out the entire `rpl_dio_genoption` structure, the function may read beyond the limits of the captured buffer and it could potentially print to output wrong information. However, `opt` is never used to write anything, so this issue could result in junk memory being displayed on the terminal of the victim user or, at most, in the tcpdump program crashing while accessing invalid memory.

Comment 5 Product Security DevOps Team 2020-11-04 02:21:47 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-2018-14882

Comment 6 errata-xmlrpc 2020-11-04 03:40:19 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