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USN-5168-1: NSS vulnerability

1 December 2021

NSS could be made to crash or run programs if it verified a specially crafted signature.

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Releases

Packages

  • nss - Network Security Service library

Details

Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS
signatures. A remote attacker could use this issue to cause NSS to crash,
resulting in a denial of service, or possibly execute arbitrary code.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 21.10
Ubuntu 21.04
Ubuntu 20.04
Ubuntu 18.04

After a standard system update you need to restart any applications that
use NSS, such as Evolution, to make all the necessary changes.

References

Related notices

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Further reading