Vulnerability Details : CVE-2020-28042
ServiceStack before 5.9.2 mishandles JWT signature verification unless an application has a custom ValidateToken function that establishes a valid minimum length for a signature.
Products affected by CVE-2020-28042
- cpe:2.3:a:servicestack:servicestack:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-28042
0.26%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 65 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-28042
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
NIST |
CWE ids for CVE-2020-28042
-
The product does not verify, or incorrectly verifies, the cryptographic signature for data.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-28042
-
https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/
Shielder - ServiceStack <=5.9.1 JWT signature verification bypassExploit;Third Party Advisory
-
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/
Shielder - Re-discovering a JWT Authentication Bypass in ServiceStackExploit;Third Party Advisory
-
https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee
Update EquivalentTo to test length & null for equality as well · ServiceStack/ServiceStack@540d406 · GitHubPatch;Third Party Advisory
-
https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850
ServiceStack v5.9.2 Released - Announcements - ServiceStack Customer ForumsRelease Notes;Vendor Advisory
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