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Ubuntu Security Notice USN-3850-2

Ubuntu Security Notice USN-3850-2
Posted Feb 18, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3850-2 - USN-3850-1 fixed several vulnerabilities in NSS. This update provides the corresponding update for Ubuntu 12.04 ESM. 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. Various other issues were also addressed.

tags | advisory, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-0495, CVE-2018-12384, CVE-2018-12404
SHA-256 | 7498b43104d4fb07034d4fa82fae12b25b42d1e94165a25a6a94e278d49e0473

Ubuntu Security Notice USN-3850-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3850-2
February 18, 2019

nss vulnerabilities
==========================================================================

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

- Ubuntu 12.04 ESM

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)

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://usn.ubuntu.com/usn/usn-3850-2
https://usn.ubuntu.com/usn/usn-3850-1
CVE-2018-0495, CVE-2018-12384, CVE-2018-12404
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