JVNVU#90916766
jwt-scala fails to verify token signatures
Overview
jwt-scala contains a vulnerability where it fails to verify token signatures correctly.
Products Affected
- jwt-scala 1.2.2 and earlier
Description
jwt-scala is a Scala library to handle JSON Web Token (JWT). jwt-scala contains a vulnerability where it fails to verify token signatures correctly due to improper processing of JWT headers.
Impact
Specially crafted tokens may be verified successfully, whereas the verification should be failed.
Solution
Use the Latest Source Code
The source code patch is applied on the github repository on September 11, 2017.
Apply a Workaround
Check that alg field value in the JWT header is appropriate.
Vendor Status
| Vendor | Link |
| reallyl IO | jwt-scala |
References
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Credit
Toshiharu Sugiyama of Recruit Technologies Co.,Ltd. RED TEAM reported this vulnerability to the developer and JPCERT/CC and directly coordinated with the developer. JPCERT/CC published this advisory as the developer agreed with the publication on JVN.
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2017-10862 |
| JVN iPedia |
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