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

Quick assessment

Affected
sporkmonger addressable
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Addressable是一个应用软件。URI 实现的替代实现，它是 Ruby 标准库的一部分。 Addressable 存在安全漏洞，该漏洞源于在Addressable中的URI模板实现中，恶意制作的模板可能会导致不受控制的资源消耗，从而在与URI匹配时导致拒绝服务。

CVSS 7.5 · High EPSS 2.20% · P82

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-32740

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service in Addressable templates
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Addressable资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Addressable是一个应用软件。URI 实现的替代实现，它是 Ruby 标准库的一部分。 Addressable 存在安全漏洞，该漏洞源于在Addressable中的URI模板实现中，恶意制作的模板可能会导致不受控制的资源消耗，从而在与URI匹配时导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sporkmonger addressable > 2.3.0, <= 2.7.0 -

II. Public POCs for CVE-2021-32740

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III. Intelligence Information for CVE-2021-32740

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Patches & Fixes for CVE-2021-32740 (1)

Vendor Advisories for CVE-2021-32740 (1)

Mailing List Discussions for CVE-2021-32740 (2)

IV. Related Vulnerabilities

Same product: addressable
Same vendor: sporkmonger
Same weakness: CWE-400

V. Comments for CVE-2021-32740

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