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Ubuntu 21.04: USN-5034-1 Critical: c-ares Domain Hijacking Risk

ubuntu
Calendar Grey August 10, 2021
Dist Ubuntu Esm H88
C-ares security flaw leads to improper hostname verification, posing threats for domain takeover on Debian platforms.
c-ares could be made to return wrong domains.

Summary

c-ares could be made to return wrong domains.

Software Description:

- c-ares: library for asynchronous name resolution

Details:

Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly

validated certain hostnames returned by DNS servers. A remote attacker

could possibly use this issue to perform Domain Hijacking attacks.

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu domain hijacking c-ares DNS validation

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
  libc-ares2                      1.17.1-1ubuntu0.1

Ubuntu 20.04 LTS:
  libc-ares2                      1.15.0-1ubuntu0.1

Ubuntu 18.04 LTS:
  libc-ares2                      1.14.0-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5034-1

CVE-2021-3672

Severity
critical
Lowest
Low
Medium
High
Critical

August 10, 2021

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu domain hijacking c-ares DNS validation

Package Information

https://launchpad.net/ubuntu/+source/c-ares/1.17.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/c-ares/1.15.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/c-ares/1.14.0-1ubuntu0.1

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