[USN-6663-1] OpenSSL update

David Fernandez Gonzalez david.fernandezgonzalez at canonical.com
Tue Feb 27 12:40:49 UTC 2024

Ubuntu Security Notice USN-6663-1
February 27, 2024

openssl update

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

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)


Add implicit rejection in PKCS#1 v1.5 in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools


As a security improvement, this update prevents OpenSSL
from returning an error when detecting wrong padding
in PKCS#1 v1.5 RSA, to prevent its use in possible
Bleichenbacher timing attacks.

Update instructions:

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

Ubuntu 23.10:
   libssl-doc                      3.0.10-1ubuntu2.3
   libssl3                         3.0.10-1ubuntu2.3
   openssl                         3.0.10-1ubuntu2.3

Ubuntu 22.04 LTS:
   libssl-doc                      3.0.2-0ubuntu1.15
   libssl3                         3.0.2-0ubuntu1.15
   openssl                         3.0.2-0ubuntu1.15

Ubuntu 20.04 LTS:
   libssl-doc                      1.1.1f-1ubuntu2.22
   libssl1.1                       1.1.1f-1ubuntu2.22
   openssl                         1.1.1f-1ubuntu2.22

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libssl-doc                      1.1.1-1ubuntu2.1~18.04.23+esm5
   libssl1.1                       1.1.1-1ubuntu2.1~18.04.23+esm5
   openssl                         1.1.1-1ubuntu2.1~18.04.23+esm5

After a standard system update you need to reboot your computer to make
all the necessary changes.


Package Information:

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_0x96F770C739BC5ACE.asc
Type: application/pgp-keys
Size: 3220 bytes
Desc: OpenPGP public key
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20240227/ec40bf4b/attachment.key>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20240227/ec40bf4b/attachment.sig>

More information about the ubuntu-security-announce mailing list