Exploit/Advisories

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Ubuntu Security Notice USN-5080-1
September 16, 2021

libgcrypt20 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library

Details:

It was discovered that Libgcrypt incorrectly handled ElGamal encryption. An
attacker could possibly use this issue to recover sensitive information.

Update instructions:

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

Ubuntu 21.04:
libgcrypt20 1.8.7-2ubuntu2.1

Ubuntu 20.04 LTS:
libgcrypt20 1.8.5-5ubuntu1.1

Ubuntu 18.04 LTS:
libgcrypt20 1.8.1-4ubuntu1.3

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

References:
https://ubuntu.com/security/notices/USN-5080-1
CVE-2021-33560, CVE-2021-40528

Package Information:
https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.7-2ubuntu2.1
https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.5-5ubuntu1.1
https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.1-4ubuntu1.3

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