CVE-2022-3500 Keylime: unhandled exceptions could lead to invalid attestation states
A rogue agent can trigger exceptions in the Keylime verifier, causing denial of service and leaving hosts in an unverified but attested state.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-3500?
CVE-2022-3500 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 22 Nov 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in keylime. This security issue happens in some circumstances, due to some improperly handled exceptions, there exists the possibility that a rogue agent could create errors on the verifier that stopped attestation attempts for that host leaving it in an attested state but not verifying that anymore.
Weakness: CWE-248
Which versions are affected by CVE-2022-3500?
3 open source packages ship an affected version, including keylime. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
keylime PyPI | All versions | 6.5.1 |
keylime PyPI | All versions | 6.5.1 |
keylime PyPI | All versions | 6.5.1 |
Linux distribution packages (17)
keylime AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
keylime-base AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
keylime-registrar AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
keylime-selinux AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
keylime-tenant AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
keylime-verifier AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
python3-keylime AlmaLinux:9 | All versions | 6.5.1-1.el9_1 |
keylime Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
keylime-base Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
keylime-registrar Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
keylime-selinux Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
keylime-tenant Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
keylime-verifier Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
python3-keylime Red Hat:enterprise_linux:9::appstream | All versions | 0:6.5.1-1.el9_1 |
keylime Rocky Linux:9 | All versions | 0:6.5.1-1.el9_1.4 |
keylime SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 6.3.2-150400.4.14.1 |
keylime openSUSE:Leap 15.4 | All versions | 6.3.2-150400.4.14.1 |
Products include Fedoraproject Fedora, Keylime Keylime, Redhat Enterprise Linux.
How do I fix CVE-2022-3500?
Upgrade keylime to 6.5.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-3500 being exploited?
There is no known exploitation of CVE-2022-3500 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALSA-2022:8444, GHSA-hff2-x2j9-gxgv, PYSEC-2022-42995, RHSA-2022:8444, RLSA-2022:8444, SUSE-SU-2022:4204-1.