Ubuntu 4906-1: Nettle vulnerability | LinuxSecurity.com

Advisories

==========================================================================
Ubuntu Security Notice USN-4906-1
April 13, 2021

nettle vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Nettle could be made to crash or bypass signature verification if it
opened a specially crafted certificate.

Software Description:
- nettle: low level cryptographic library

Details:

It was discovered that Nettle incorrectly handled signature verification.
A remote attacker could use this issue to cause Nettle to crash, resulting
in a denial of service, or possibly force invalid signatures.

Update instructions:

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

Ubuntu 20.10:
  libnettle8                      3.6-2ubuntu0.1

Ubuntu 20.04 LTS:
  libnettle7                      3.5.1+really3.5.1-2ubuntu0.1

Ubuntu 18.04 LTS:
  libnettle6                      3.4-1ubuntu0.1

Ubuntu 16.04 LTS:
  libnettle6                      3.2-1ubuntu0.16.04.2

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

References:
  https://ubuntu.com/security/notices/USN-4906-1
  CVE-2021-20305

Package Information:
  https://launchpad.net/ubuntu/+source/nettle/3.6-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/nettle/3.5.1+really3.5.1-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/nettle/3.4-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/nettle/3.2-1ubuntu0.16.04.2

Ubuntu 4906-1: Nettle vulnerability

April 13, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Nettle could be made to crash or bypass signature verification if it opened a specially crafted certificate. Software Description: - nettle: low level cryptographic library Details: It was discovered that Nettle incorrectly handled signature verification. A remote attacker could use this issue to cause Nettle to crash, resulting in a denial of service, or possibly force invalid signatures.

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: libnettle8 3.6-2ubuntu0.1 Ubuntu 20.04 LTS: libnettle7 3.5.1+really3.5.1-2ubuntu0.1 Ubuntu 18.04 LTS: libnettle6 3.4-1ubuntu0.1 Ubuntu 16.04 LTS: libnettle6 3.2-1ubuntu0.16.04.2 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4906-1

CVE-2021-20305

Severity
Ubuntu Security Notice USN-4906-1

Package Information

https://launchpad.net/ubuntu/+source/nettle/3.6-2ubuntu0.1 https://launchpad.net/ubuntu/+source/nettle/3.5.1+really3.5.1-2ubuntu0.1 https://launchpad.net/ubuntu/+source/nettle/3.4-1ubuntu0.1 https://launchpad.net/ubuntu/+source/nettle/3.2-1ubuntu0.16.04.2

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