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CVE-2021-21240— Regular Expression Denial of Service in httplib2

Quick assessment

Affected
httplib2 httplib2
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.

httplib2是一款HTTP客户端库。 httplib2 0.19.0之前的版本中存在安全漏洞，该漏洞源于在 www-authenticate 报头中响应长串 xa0 字符可能会导致httpplib2客户端访问该服务器时拒绝服务。

CVSS 7.5 · High EPSS 3.63% · P89

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-21240

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service in httplib2
Source: CVE Program / CVE List V5
Vulnerability Description
httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.
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
httplib2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
httplib2是一款HTTP客户端库。 httplib2 0.19.0之前的版本中存在安全漏洞，该漏洞源于在 www-authenticate 报头中响应长串 xa0 字符可能会导致httpplib2客户端访问该服务器时拒绝服务。
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
httplib2 httplib2 < 0.19.0 -

II. Public POCs for CVE-2021-21240

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III. Intelligence Information for CVE-2021-21240

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Patches & Fixes for CVE-2021-21240 (2)

Vendor Advisories for CVE-2021-21240 (1)

Other References for CVE-2021-21240 (1)

IV. Related Vulnerabilities

Same product: httplib2
Same vendor: httplib2
Same weakness: CWE-400

V. Comments for CVE-2021-21240

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