Vulnerability in Apache Pulsar
CVE-2023-51437
Observable timing discrepancy vulnerability in Apache Pulsar SASL Authentication Provider can allow an attacker to forge a SASL Role Token that will pass signature verification. Users are recommended to upgrade to version 2.11.3, 3.0.2, or 3.1.1 which fixes the issue. Users should also consider updating the configured secret in the `saslJaasServerRoleTokenSignerSecretPath` file. Any component matching an above version running the SASL Authentication Provider is affected. That includes the Pulsar Broker, Proxy, Websocket Proxy, or Function Worker. 2.11 Pulsar users should upgrade to at least 2.11.3. 3.0 Pulsar users should upgrade to at least 3.0.2. 3.1 Pulsar users should upgrade to at least 3.1.1. Any users running Pulsar 2.8, 2.9, 2.10, and earlier should upgrade to one of the above patched versions. For additional details on this attack vector, please refer to https://codahale.com/a-lesson-in-timing-attacks/ .
EPSS: 0.008 (51.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Apache Pulsar — versions 3.1.0
- Apache Software Foundation Pulsar — versions 0, 2.11.0, 3.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (vendor-advisory, Issue Tracking, Vendor Advisory)
- security@apache.org
Frequently asked questions
- What is CVE-2023-51437?
- CVE-2023-51437 is a high-severity vulnerability in Apache Pulsar, classified under Observable Discrepancy. CVSS score: 7.4/10. Published 2024-02-07.
- How severe is CVE-2023-51437?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2023-51437 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.