RHSA-2021:1627 - Security Advisory

Topic

An update for TrouSerS 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

TrouSerS is an implementation of the Trusted Computing Group's Software Stack (TSS) specification. TrouSerS enables the user to write applications that make use of the Trusted Platform Module (TPM) hardware.

The following packages have been upgraded to a later upstream version: trousers (0.3.15). (BZ#1725782)

Security Fix(es):

• trousers: tss user still has read and write access to the /etc/tcsd.conf file if tcsd is started as root (CVE-2020-24331)
• trousers: tss user can be used to create or corrupt existing files, this could lead to DoS (CVE-2020-24332)
• trousers: fails to drop the root gid privilege when no longer needed (CVE-2020-24330)

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 8.4 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
• 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 - 1870052 - CVE-2020-24332 trousers: tss user can be used to create or corrupt existing files, this could lead to DoS
• BZ - 1870054 - CVE-2020-24330 trousers: fails to drop the root gid privilege when no longer needed
• BZ - 1870056 - CVE-2020-24331 trousers: tss user still has read and write access to the /etc/tcsd.conf file if tcsd is started as root

CVEs

• CVE-2020-24330
• CVE-2020-24331
• CVE-2020-24332

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/