CVE-2018-16838 Auth bypass in sssd
Medium 5.4
Published
Updated
Check this codebase for CVE-2018-16838 and fix it if it is affected.
What it is: CVE-2018-16838 is a medium-severity authentication bypass vulnerability in Redhat Enterprise Linux, published on 25 Mar 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-16838 in the wild and no public exploit code.
Affected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2018-16838/ (Markdown: https://insights.sbomify.com/CVE-2018-16838/index.md)
SSSD allows all authenticated users to log in when Group Policy Objects are unreadable due to strict server-side permissions, bypassing access controls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-16838?
CVE-2018-16838 is a medium-severity authentication bypass vulnerability in Redhat Enterprise Linux, published on 25 Mar 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in sssd Group Policy Objects implementation. When the GPO is not readable by SSSD due to a too strict permission settings on the server side, SSSD will allow all authenticated users to login instead of denying access.
Which versions are affected by CVE-2018-16838?
It affects 2 products.
Linux distribution packages (40)
libipa_hbac Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libipa_hbac-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_autofs Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_autofs-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_certmap Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_certmap-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_idmap Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_idmap-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_nss_idmap Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_nss_idmap-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_simpleifp Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_simpleifp-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_sudo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
libsss_sudo-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-libipa_hbac Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-libipa_hbac-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-libsss_nss_idmap Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-libsss_nss_idmap-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-sss Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-sss-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-sss-murmur Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-sss-murmur-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
python3-sssdconfig Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-ad Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-ad-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-client Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-client-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-common Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-common-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-common-pac Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-common-pac-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-dbus Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-dbus-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-ipa Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-ipa-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-kcm Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
sssd-kcm-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:2.2.0-19.el8 |
Products include Fedoraproject Sssd, Redhat Enterprise Linux.
How do I fix CVE-2018-16838?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2018-16838 being exploited?
There is no known exploitation of CVE-2018-16838 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
Sources
Also known as DEBIAN-CVE-2018-16838, GHSA-h2vj-4wwx-54q4, MGASA-2019-0395, RHSA-2019:3651, SUSE-SU-2019:1476-1, SUSE-SU-2019:1477-1 and 3 more.