CVE-2021-32740 Regular Expression Denial of Service in Addressable templates

2021-07-0614:15:12

CWE-400

GitHub_M

www.cve.org

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.7 High

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

65.3%

JSON

Addressable is an alternative implementation to the URI implementation that is part of Ruby’s standard library. An uncontrolled resource consumption vulnerability exists after version 2.3.0 through version 2.7.0. Within the URI template implementation in Addressable, a maliciously crafted template may result in uncontrolled resource consumption, leading to denial of service when matched against a URI. In typical usage, templates would not normally be read from untrusted user input, but nonetheless, no previous security advisory for Addressable has cautioned against doing this. Users of the parsing capabilities in Addressable but not the URI template capabilities are unaffected. The vulnerability is patched in version 2.8.0. As a workaround, only create Template objects from trusted sources that have been validated not to produce catastrophic backtracking.

CNA Affected

[
  {
    "product": "addressable",
    "vendor": "sporkmonger",
    "versions": [
      {
        "status": "affected",
        "version": "> 2.3.0, <= 2.7.0"
      }
    ]
  }
]