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Ubuntu: 3850-2 Moderate: NSS Cache Timing And Replay Attacks

ubuntu
Calendar Grey February 18, 2019
Dist Ubuntu Esm H88
Several vulnerabilities corrected in Ubuntu Security Notice USN-3850-3, with essential patches suggested.
Several security issues were fixed in NSS.

Summary

Several security issues were fixed in NSS.

Software Description:

- nss: Network Security Service library

Details:

USN-3850-1 fixed several vulnerabilities in NSS. This update provides

the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Keegan Ryan discovered that NSS incorrectly handled ECDSA key

 generation. A local attacker could possibly use this issue to perform

 a cache-timing attack and recover private ECDSA keys. (CVE-2018-0495)

 It was discovered that NSS incorrectly handled certain v2-compatible

 ClientHello messages. A remote attacker could possibly use this issue

 to perform a replay attack. (CVE-2018-12384)

 It was discovered that NSS incorrectly handled certain padding

 oracles. A remote attacker could possibly use this issue to perform a

 variant of the Bleichenbacher attack. (CVE-2018-12404)

Topics%20covered

Topics Covered

security advisory security issue DoS Ubuntu NSS replay attack cache-timing attack

Update Instructions

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

Ubuntu 12.04 ESM:
  libnss3                         2:3.28.4-0ubuntu0.12.04.2

After a standard system update you need to restart any applications
that use NSS, such as Evolution, to make all the necessary changes.

References

  https://ubuntu.com/security/notices/USN-3850-2

  https://ubuntu.com/security/notices/USN-3850-1

  CVE-2018-0495, CVE-2018-12384, CVE-2018-12404

Severity
important
Lowest
Low
Medium
High
Critical

February 18, 2019

Topics%20covered

Topics Covered

security advisory security issue DoS Ubuntu NSS replay attack cache-timing attack

Package Information

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