Moderate: rpm security update

Topic

An update for rpm 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 RPM Package Manager (RPM) is a command-line driven package management system capable of installing, uninstalling, verifying, querying, and updating software packages.

Security Fix(es):

• rpm: TOCTOU race in checks for unsafe symlinks (CVE-2021-35937)
• rpm: races with chown/chmod/capabilities calls during installation (CVE-2021-35938)
• rpm: checks for unsafe symlinks are not performed for intermediary directories (CVE-2021-35939)

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

All running applications linked against the RPM library must be restarted for this update to take effect.

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 - 1964114 - CVE-2021-35938 rpm: races with chown/chmod/capabilities calls during installation
• BZ - 1964125 - CVE-2021-35937 rpm: TOCTOU race in checks for unsafe symlinks
• BZ - 1964129 - CVE-2021-35939 rpm: checks for unsafe symlinks are not performed for intermediary directories

CVEs

• CVE-2021-35937
• CVE-2021-35938
• CVE-2021-35939

References

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