Synopsis

Moderate: gnutls security, bug fix, and enhancement update

Type/Severity

Security Advisory: Moderate

Topic

An update for gnutls is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

The following packages have been upgraded to a later upstream version: gnutls (3.3.29). (BZ#1561481)

Security Fix(es):

• gnutls: HMAC-SHA-256 vulnerable to Lucky thirteen attack due to not enough dummy function calls (CVE-2018-10844)
• gnutls: HMAC-SHA-384 vulnerable to Lucky thirteen attack due to use of wrong constant (CVE-2018-10845)
• gnutls: "Just in Time" PRIME + PROBE cache-based side channel attack can lead to plaintext recovery (CVE-2018-10846)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le

Fixes

• BZ - 1375307 - Deleting softhsm PKCS#11 objects does not work with p11tool --(so-)login
• BZ - 1434091 - Session renegotiation fails with client certificates
• BZ - 1444792 - Provide ability to set the expected server name in gnutls-serv utility [rhel-7]
• BZ - 1460125 - p11tool: cannot import private keys into Atos HSM
• BZ - 1464896 - p11tool cannot generate DSA keys
• BZ - 1561481 - Rebase gnutls to upstream version 3.3.29
• BZ - 1582571 - CVE-2018-10844 gnutls: HMAC-SHA-256 vulnerable to Lucky thirteen attack due to not enough dummy function calls
• BZ - 1582572 - CVE-2018-10845 gnutls: HMAC-SHA-384 vulnerable to Lucky thirteen attack due to use of wrong constant
• BZ - 1582574 - CVE-2018-10846 gnutls: "Just in Time" PRIME + PROBE cache-based side channel attack can lead to plaintext recovery

CVEs

• CVE-2018-10844
• CVE-2018-10845
• CVE-2018-10846

References