RHSA-2021:4451 - Security Advisory

Topic

An update for gnutls and nettle is now available for Red Hat Enterprise Linux 8.

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.

Nettle is a cryptographic library that is designed to fit easily in almost any context: In crypto toolkits for object-oriented languages, such as C++, Python, or Pike, in applications like LSH or GNUPG, or even in kernel space.

The following packages have been upgraded to a later upstream version: gnutls (3.6.16). (BZ#1956783)

Security Fix(es):

• nettle: Remote crash in RSA decryption via manipulated ciphertext (CVE-2021-3580)
• gnutls: Use after free in client key_share extension (CVE-2021-20231)
• gnutls: Use after free in client_send_params in lib/ext/pre_shared_key.c (CVE-2021-20232)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, 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 8.5 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 for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

• BZ - 1776250 - p11tool do not reuse ID for certificate matching ECDSA private key when importing to PKCS#11 device
• BZ - 1908110 - gnutls update 3.6.14-7.el8_3 includes time BOMB in tests
• BZ - 1908334 - gnutls-serv doesn't listen on IPvN loopback addresses if there are no IPvN external addresses configured
• BZ - 1922275 - CVE-2021-20232 gnutls: Use after free in client_send_params in lib/ext/pre_shared_key.c
• BZ - 1922276 - CVE-2021-20231 gnutls: Use after free in client key_share extension
• BZ - 1965445 - SHA-1 CAs are rejected even if they are explicitly trusted
• BZ - 1967983 - CVE-2021-3580 nettle: Remote crash in RSA decryption via manipulated ciphertext

CVEs

• CVE-2021-3580
• CVE-2021-20231
• CVE-2021-20232

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/