Bug 2023380 (CVE-2021-43523) - CVE-2021-43523 uclibc: incorrect handling of special characters in DNS records
Summary: CVE-2021-43523 uclibc: incorrect handling of special characters in DNS records
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-43523
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2023382
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-11-15 15:12 UTC by Marian Rehak
Modified: 2021-11-15 15:30 UTC (History)
3 users (show)

Fixed In Version: uClibc 1.0.39
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Clone Of:
Environment:
Last Closed: 2021-11-15 15:30:53 UTC
Embargoed:

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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.
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