Authentication bypass via empty-value equality
Published Dec 11, 2023 · Updated Aug 2, 2024
Authentication bypass in mojocn base64Captcha before 1.3.6 allows remote attackers to pass CAPTCHA checks with crafted inputs. The default memoryStore.Verify path retrieves an empty value for a nonexistent ID and compares it equal to an attacker-supplied empty answer. An application is exposed only when it uses the default memory store and treats a successful CAPTCHA result as a security decision.
Summary
What happened
Authentication bypass in mojocn base64Captcha before 1.3.6 allows remote attackers to pass CAPTCHA checks with crafted inputs. The default memoryStore.Verify path retrieves an empty value for a nonexistent ID and compares it equal to an attacker-supplied empty answer. An application is exposed only when it uses the default memory store and treats a successful CAPTCHA result as a security decision.
The record
- CVE
- CVE-2023-45292
- Published
- Dec 11, 2023
- Updated
- Aug 2, 2024
- Vendor
- mojocn
- Product
- base64Captcha
- Classifications
- CWE-670, CWE-345, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 11, 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=0 <1.3.6
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
- Empty-answer Verify reproducerproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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