Vulnerability Details : CVE-2017-18239
A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.
Products affected by CVE-2017-18239
- cpe:2.3:a:authentikat-jwt_project:authentikat-jwt:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-18239
0.28%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 64 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-18239
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
References for CVE-2017-18239
-
https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0
Use constant-time string comparison for sigs · jasongoodwin/authentikat-jwt@2d2fa0d · GitHubPatch;Third Party Advisory
-
https://github.com/jasongoodwin/authentikat-jwt/issues/12
add option to do full comparison to prevent time based guessing of the private key · Issue #12 · jasongoodwin/authentikat-jwt · GitHubIssue Tracking;Third Party Advisory
-
https://github.com/jasongoodwin/authentikat-jwt/pull/36
Use constant-time string comparison for sigs by anfedorov · Pull Request #36 · jasongoodwin/authentikat-jwt · GitHubIssue Tracking;Third Party Advisory
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