Authentication-state forgery via timing-leaky comparisons
Published Dec 22, 2023 · Updated Aug 2, 2024
Observable timing discrepancies in Yii 2 AuthClient Extension before 2.2.15 allow remote attackers to forge authentication state. The OAuth1 and OAuth2 state checks and OpenID Connect nonce check use strcmp, whose nonconstant comparison exposes response-timing differences. Exploitation requires network access, high-complexity timing measurements, and user interaction; the published CNA impact is limited to integrity.
Summary
What happened
Observable timing discrepancies in Yii 2 AuthClient Extension before 2.2.15 allow remote attackers to forge authentication state. The OAuth1 and OAuth2 state checks and OpenID Connect nonce check use strcmp, whose nonconstant comparison exposes response-timing differences. Exploitation requires network access, high-complexity timing measurements, and user interaction; the published CNA impact is limited to integrity.
The record
- CVE
- CVE-2023-50708
- Published
- Dec 22, 2023
- Updated
- Aug 2, 2024
- Vendor
- Yiisoft
- Product
- Yii 2 AuthClient Extension
- Classifications
- CWE-203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 22, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record 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=< 2.2.15
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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