QID 239443

QID 239443: Red Hat Update for samba (RHSA-2021:2313)

Samba is an open-source implementation of the Server Message Block (SMB)
protocol and the related Common Internet File System (CIFS)
protocol, which allow PC-compatible machines to share files, printers, and various information.

Security Fix(es): samba: Negative idmap cache entries can cause incorrect group entries in the Samba file server process token (CVE-2021-20254)

Affected Products:

Red Hat Enterprise Linux Server 7 x86_64
Red Hat Enterprise Linux Workstation 7 x86_64
Red Hat Enterprise Linux Desktop 7 x86_64
Red Hat Enterprise Linux for IBM z Systems 7 s390x
Red Hat Enterprise Linux for Power, big endian 7 ppc64
Red Hat Enterprise Linux for Scientific Computing 7 x86_64
Red Hat Enterprise Linux Resilient Storage for x86_64 7 x86_64
Red Hat Enterprise Linux for Power, little endian 7 ppc64le
Red Hat Enterprise Linux Resilient Storage for IBM z Systems 7 s390x
Red Hat Enterprise Linux Resilient Storage for Power, little endian 7 ppc64le

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

On successful exploitation, it could allow an attacker to execute code.

  • CVSS V3 rated as Critical - 8.1 severity.
  • CVSS V2 rated as Medium - 5.5 severity.
    • Solution
    Upgrade to the latest packages which contain a patch. Refer to Applying Package Updates to RHEL system for details.

    Refer to Red Hat security advisory RHSA-2021:2313 to address this issue and obtain more information.

    Vendor References

    CVEs related to QID 239443

    CVE-2021-20254 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2021:2313 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2021:2313?language=en
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