Bug 2023380 (CVE-2021-43523)

Summary:	CVE-2021-43523 uclibc: incorrect handling of special characters in DNS records
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	dvlasenk, jchaloup, nforro
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	uClibc 1.0.39	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-15 15:30:53 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:	2023382
Bug Blocks:

Description Marian Rehak 2021-11-15 15:12:50 UTC

Incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications.

https://www.openwall.com/lists/oss-security/2021/11/09/1
https://uclibc-ng.org/
https://github.com/wbx-github/uclibc-ng/commit/0f822af0445e5348ce7b7bd8ce1204244f31d174

Comment 1 Marian Rehak 2021-11-15 15:13:04 UTC

Created uClibc tracking bugs for this issue:

Affects: fedora-all [bug 2023382]

Comment 2 Product Security DevOps Team 2021-11-15 15:30:51 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.