Vulnerability Details : CVE-2020-15237
In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisory.
Products affected by CVE-2020-15237
- cpe:2.3:a:shrinerb:shrine:*:*:*:*:*:ruby:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-15237
0.32%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 52 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-15237
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
2.2
|
3.6
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
2.2
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2020-15237
-
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.Assigned by: security-advisories@github.com (Primary)
-
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.Assigned by: security-advisories@github.com (Primary)
References for CVE-2020-15237
-
https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp
Possible timing attack in derivation_endpoint · Advisory · shrinerb/shrine · GitHubThird Party Advisory
-
https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0
Securely compare signature in derivation_endpoint · shrinerb/shrine@1b27090 · GitHubPatch;Third Party Advisory
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