Credential theft via disabled OAuth TLS validation
Published Nov 4, 2022 · Updated May 2, 2025
Improper certificate validation in Apache Pulsar C++ and Python Clients allows man-in-the-middle attackers to steal OAuth2.0 credentials. ClientCredentialFlow explicitly disables libcurl peer and host verification for issuer discovery and token requests, overriding secure configuration. Exploitation requires an active on-path attacker, who can intercept or alter issuer traffic and reuse exposed client credentials to authenticate to a Pulsar cluster.
Summary
What happened
Improper certificate validation in Apache Pulsar C++ and Python Clients allows man-in-the-middle attackers to steal OAuth2.0 credentials. ClientCredentialFlow explicitly disables libcurl peer and host verification for issuer discovery and token requests, overriding secure configuration. Exploitation requires an active on-path attacker, who can intercept or alter issuer traffic and reuse exposed client credentials to authenticate to a Pulsar cluster.
The record
- CVE
- CVE-2022-33684
- Published
- Nov 4, 2022
- Updated
- May 2, 2025
- Vendor
- The Apache Software Foundation
- Product
- Apache Pulsar
- Classifications
- CWE-295, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 4, 2022CVE publishedPublication date reported by the CVE source.
- May 2, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.10 <=2.10.1
- Affected versionversion=2.6 and earlier <=2.6.4
- Affected versionversion=2.7 <=2.7.4
- Affected versionversion=2.8 <=2.8.3
- Affected versionversion=2.9 <=2.9.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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