RHSA-2021:4424 - Security Advisory

Topic

An update for openssl 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

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

• openssl: integer overflow in CipherUpdate (CVE-2021-23840)
• openssl: NULL pointer dereference in X509_issuer_and_serial_hash() (CVE-2021-23841)

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

For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.

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 - 1908036 - openssl listens on IPv4 "any" socket only not on IPv6
• BZ - 1930310 - CVE-2021-23841 openssl: NULL pointer dereference in X509_issuer_and_serial_hash()
• BZ - 1930324 - CVE-2021-23840 openssl: integer overflow in CipherUpdate
• BZ - 1934534 - Rebase OpenSSL to 1.1.1k
• BZ - 1934600 - DTLS1.0 connections are allowed in DEFAULT crypto-policy [rhel-8]
• BZ - 1939637 - Openssl -dtls option breaks in FIPS mode[rhel8]
• BZ - 1940085 - FIPS_selftest() fails in FIPS mode.
• BZ - 1965362 - In renegotiated handshake openssl sends extensions which client didn't advertise in second ClientHello [rhel-8]

CVEs

• CVE-2021-23840
• CVE-2021-23841

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/