Bug 1666667 (CVE-2018-20679)

Summary:	CVE-2018-20679 busybox: Out of bounds read in udhcp components resulting in information disclosure
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	admiller, athmanem, dvlasenk
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	busybox 1.30.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-01-22 14:10:53 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:	1666668
Bug Blocks:	1666670

Description Andrej Nemec 2019-01-16 10:30:31 UTC

An issue was discovered in BusyBox before 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and relay) allows a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to verification in udhcp_get_option() in networking/udhcp/common.c that 4-byte options are indeed 4 bytes.

Upstream issue:

https://bugs.busybox.net/show_bug.cgi?id=11506

Upstream patch:

https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c

Comment 1 Andrej Nemec 2019-01-16 10:31:19 UTC

Created busybox tracking bugs for this issue:

Affects: fedora-all [bug 1666668]

Comment 2 Stefan Cornelius 2019-01-22 14:09:26 UTC

Statement:

This issue did not affect the versions of busybox as shipped with Red Hat Enterprise Linux 5 and 6.