ALAS-2024-573

Amazon Linux 2023 Security Advisory: ALAS-2024-573
Advisory Release Date: 2024-03-13 22:20 Pacific
Advisory Updated Date: 2024-03-21 14:00 Pacific
Severity: Medium
Issue Overview:

A race condition vulnerability was found in rpm. A local unprivileged user could use this flaw to bypass the checks that were introduced in response to CVE-2017-7500 and CVE-2017-7501, potentially gaining root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-35937)

A symbolic link issue was found in rpm. It occurs when rpm sets the desired permissions and credentials after installing a file. A local unprivileged user could use this flaw to exchange the original file with a symbolic link to a security-critical file and escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-35938)

It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

This issue requires that the attacker have admin privileges on the target system, and be able to own and modify system files. Considering the tradeoff between the stability of Amazon Linux and the impact of CVE-2021-35939 a fix will not be provided for Amazon Linux 1, Amazon Linux 2 and Amazon Linux 2023 at this time. (CVE-2021-35939)


Affected Packages:

rpm


Issue Correction:
Run dnf update rpm --releasever 2023.4.20240319 to update your system.

New Packages:
aarch64:
    rpm-sign-libs-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-libs-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-systemd-inhibit-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-syslog-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-fapolicyd-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-build-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-fapolicyd-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-prioreset-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-sign-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-systemd-inhibit-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-syslog-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-libs-4.16.1.3-29.amzn2023.0.6.aarch64
    python3-rpm-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-audit-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-prioreset-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-sign-libs-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-devel-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-ima-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-build-libs-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-selinux-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-build-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-sign-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-build-libs-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    python3-rpm-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-debugsource-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-debuginfo-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-devel-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-audit-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-selinux-4.16.1.3-29.amzn2023.0.6.aarch64
    rpm-plugin-ima-4.16.1.3-29.amzn2023.0.6.aarch64

noarch:
    rpm-apidocs-4.16.1.3-29.amzn2023.0.6.noarch
    rpm-cron-4.16.1.3-29.amzn2023.0.6.noarch

src:
    rpm-4.16.1.3-29.amzn2023.0.6.src

x86_64:
    rpm-libs-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-build-libs-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-ima-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-systemd-inhibit-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-ima-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-audit-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-sign-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-devel-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-fapolicyd-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-sign-libs-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-prioreset-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-selinux-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    python3-rpm-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-build-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-build-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-sign-4.16.1.3-29.amzn2023.0.6.x86_64
    python3-rpm-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-syslog-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-audit-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-selinux-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-sign-libs-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-devel-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-fapolicyd-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-debugsource-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-systemd-inhibit-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-prioreset-debuginfo-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-build-libs-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-plugin-syslog-4.16.1.3-29.amzn2023.0.6.x86_64
    rpm-libs-4.16.1.3-29.amzn2023.0.6.x86_64

Additional References

Red Hat: CVE-2021-35937, CVE-2021-35938, CVE-2021-35939

Mitre: CVE-2021-35937, CVE-2021-35938, CVE-2021-35939