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Ubuntu 23.10: 6663-1 Moderate: OpenSSL PKCS#1 Timing Attack

ubuntu
Calendar Grey February 27, 2024
Dist Ubuntu Esm H88
Mitigates the risk of timing attacks by ensuring OpenSSL does not reveal padding errors in PKCS#1 v1.5 across several Ubuntu versions.
Add implicit rejection in PKCS#1 v1.5 in OpenSSL.

Summary

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

Software Description:

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

Details:

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.

Topics%20covered

Topics Covered

security advisory timing attack ubuntu openssl padding error

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.

References

  https://ubuntu.com/security/notices/USN-6663-1

  https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/2054090

Ubuntu Security Notice USN-6663-1

Topics%20covered

Topics Covered

security advisory timing attack ubuntu openssl padding error

Package Information

  https://launchpad.net/ubuntu/+source/openssl/3.0.10-1ubuntu2.3
  https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.15
  https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.22

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