CVE-2020-15237CWE-203CWE-208

Timing attack in Shrine

Medium · published October 5, 2020

CVSS v3.1
5.9
EPSS
1%
Percentile
63.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.01015 · 63.0th percentile
Weaknesses
CWE-203 · Observable Discrepancy; CWE-208 · Observable Timing Discrepancy
Published
2020-10-05T18:30Z
EPSS history
Timeline
  • 05 OCT 18:30Z
    Timing attack in Shrine
    cvelistv5