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Ubuntu 25.04, 24.10: USN-7477-1 critical: c-ares DoS issue

ubuntu
Calendar Grey May 5, 2025
Dist Ubuntu Esm H88
c-ares is susceptible to failure when processing malicious network packets; ensure your Ubuntu installations are updated to prevent service interruptions.
c-ares could be made to crash if it received specially crafted network traffic.

Summary

c-ares could be made to crash if it received specially crafted network

traffic.

Software Description:

- c-ares: library for asynchronous name resolution

Details:

It was discovered that c-ares incorrectly handled re-enqueuing certain

queries. A remote attacker could possibly use this issue to cause c-ares to

crash, resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory DoS Ubuntu application crash network threat c-ares

Update Instructions

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

Ubuntu 25.04
   libcares2                       1.34.4-2.1ubuntu0.1

Ubuntu 24.10
   libcares2                       1.33.0-1ubuntu0.1

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

References

https://ubuntu.com/security/notices/USN-7477-1

CVE-2025-31498

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7477-1

Topics%20covered

Topics Covered

security advisory DoS Ubuntu application crash network threat c-ares

Package Information

https://launchpad.net/ubuntu/+source/c-ares/1.34.4-2.1ubuntu0.1
https://launchpad.net/ubuntu/+source/c-ares/1.33.0-1ubuntu0.1

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