Moderate: glibc security update

Topic

An update for glibc 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 glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

Security Fix(es):

• glibc: Off-by-one buffer overflow/underflow in getcwd() (CVE-2021-3999)
• glibc: Stack-based buffer overflow in svcunix_create via long pathnames (CVE-2022-23218)
• glibc: Stack-based buffer overflow in sunrpc clnt_create via a long pathname (CVE-2022-23219)

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.

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 glibc 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 Virtualization Host 4 for RHEL 8 x86_64
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 8 s390x

Fixes

• BZ - 2024637 - CVE-2021-3999 glibc: Off-by-one buffer overflow/underflow in getcwd()
• BZ - 2042013 - CVE-2022-23218 glibc: Stack-based buffer overflow in svcunix_create via long pathnames
• BZ - 2042017 - CVE-2022-23219 glibc: Stack-based buffer overflow in sunrpc clnt_create via a long pathname

CVEs

• CVE-2021-3999
• CVE-2022-23218
• CVE-2022-23219

References

• https://access.redhat.com/security/updates/classification/#moderate