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AUSCERT External Security Bulletin Redistribution
ESB-2019.1945
USN-3999-1: GnuTLS vulnerabilities
31 May 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: GnuTLS
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-3836 CVE-2019-3829 CVE-2018-10846
CVE-2018-10845 CVE-2018-10844
Reference: ESB-2019.1477
ESB-2019.1089
ESB-2019.0545
ESB-2018.3904
Original Bulletin:
https://usn.ubuntu.com/3999-1/
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USN-3999-1: GnuTLS vulnerabilities
30 May 2019
gnutls28 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in GnuTLS.
Software Description
o 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
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2018-10844
o CVE-2018-10845
o CVE-2018-10846
o CVE-2019-3829
o CVE-2019-3836
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