[USN-4990-1] Nettle vulnerabilities
marc.deslauriers at canonical.com
Thu Jun 17 11:35:48 UTC 2021
Ubuntu Security Notice USN-4990-1
June 17, 2021
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Several security issues were fixed in Nettle.
- nettle: low level cryptographic library
It was discovered that Nettle incorrectly handled RSA decryption. A remote
attacker could possibly use this issue to cause Nettle to crash, resulting
in a denial of service. (CVE-2021-3580)
It was discovered that Nettle incorrectly handled certain padding oracles.
A remote attacker could possibly use this issue to perform a variant of the
Bleichenbacher attack. This issue only affected Ubuntu 18.04 LTS.
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
Ubuntu 18.04 LTS:
In general, a standard system update will make all the necessary changes.
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