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Ubuntu Security Notice USN-3999-1

Ubuntu Security Notice USN-3999-1
Posted May 30, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3999-1 - Eyal Ronen, Kenneth G. Paterson, and Adi Shamir discovered that GnuTLS was vulnerable to a timing side-channel attack known as the "Lucky Thirteen" issue. A remote attacker could possibly use this issue to perform plaintext-recovery attacks via analysis of timing data. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Tavis Ormandy discovered that GnuTLS incorrectly handled memory when verifying certain X.509 certificates. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2018-10844, CVE-2018-10845, CVE-2018-10846, CVE-2019-3829, CVE-2019-3836
SHA-256 | b8834a0c4a4415f7835754310e5da31860dabee4b26c193e7e1297853870b1e3

Ubuntu Security Notice USN-3999-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3999-1
May 30, 2019

gnutls28 vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in GnuTLS.

Software Description:
- gnutls28: GNU TLS library

Details:

Eyal Ronen, Kenneth G. Paterson, and Adi Shamir discovered that GnuTLS was
vulnerable to a timing side-channel attack known as the "Lucky Thirteen"
issue. A remote attacker could possibly use this issue to perform
plaintext-recovery attacks via analysis of timing data. This issue only
affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-10844,
CVE-2018-10845, CVE-2018-10846)

Tavis Ormandy discovered that GnuTLS incorrectly handled memory when
verifying certain X.509 certificates. A remote attacker could use this
issue to cause GnuTLS to crash, resulting in a denial of service, or
possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS,
Ubuntu 18.10, and Ubuntu 19.04. (CVE-2019-3829)

It was discovered that GnuTLS incorrectly handled certain post-handshake
messages. A remote attacker could use this issue to cause GnuTLS to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 18.10 and Ubuntu 19.04. (CVE-2019-3836)

Update instructions:

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

Ubuntu 19.04:
libgnutls30 3.6.5-2ubuntu1.1

Ubuntu 18.10:
libgnutls30 3.6.4-2ubuntu1.2

Ubuntu 18.04 LTS:
libgnutls30 3.5.18-1ubuntu1.1

Ubuntu 16.04 LTS:
libgnutls30 3.4.10-4ubuntu1.5

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3999-1
CVE-2018-10844, CVE-2018-10845, CVE-2018-10846, CVE-2019-3829,
CVE-2019-3836

Package Information:
https://launchpad.net/ubuntu/+source/gnutls28/3.6.5-2ubuntu1.1
https://launchpad.net/ubuntu/+source/gnutls28/3.6.4-2ubuntu1.2
https://launchpad.net/ubuntu/+source/gnutls28/3.5.18-1ubuntu1.1
https://launchpad.net/ubuntu/+source/gnutls28/3.4.10-4ubuntu1.5
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