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CVE-2021-32674— Remote Code Execution via traversal in TAL expressions

Quick assessment

Affected
zopefoundation Zope
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.

Zope是Zope（ZOPE）社区的一套使用Python语言编写的、面向对象的开源Web应用服务器。 Zope存在路径遍历漏洞，该漏洞源于不受信任的模块可以通过Python模块间接获得，这些模块可以直接使用。

CVSS 8.8 · High EPSS 1.59% · P75

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32674

Vulnerability Information
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Vulnerability Title
Remote Code Execution via traversal in TAL expressions
Source: CVE Program / CVE List V5
Vulnerability Description
Zope is an open-source web application server. This advisory extends the previous advisory at https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36 with additional cases of TAL expression traversal vulnerabilities. Most Python modules are not available for using in TAL expressions that you can add through-the-web, for example in Zope Page Templates. This restriction avoids file system access, for example via the 'os' module. But some of the untrusted modules are available indirectly through Python modules that are available for direct use. By default, you need to have the Manager role to add or edit Zope Page Templates through the web. Only sites that allow untrusted users to add/edit Zope Page Templates through the web are at risk. The problem has been fixed in Zope 5.2.1 and 4.6.1. The workaround is the same as for https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36: A site administrator can restrict adding/editing Zope Page Templates through the web using the standard Zope user/role permission mechanisms. Untrusted users should not be assigned the Zope Manager role and adding/editing Zope Page Templates through the web should be restricted to trusted users only.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Zope 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zope是Zope（ZOPE）社区的一套使用Python语言编写的、面向对象的开源Web应用服务器。 Zope存在路径遍历漏洞，该漏洞源于不受信任的模块可以通过Python模块间接获得，这些模块可以直接使用。
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
zopefoundation Zope >= 5.0.0, < 5.2.1 -

II. Public POCs for CVE-2021-32674

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III. Intelligence Information for CVE-2021-32674

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Patches & Fixes for CVE-2021-32674 (1)

Vendor Advisories for CVE-2021-32674 (2)

Other References for CVE-2021-32674 (1)

IV. Related Vulnerabilities

Same product: Zope
Same vendor: zopefoundation
Same weakness: CWE-22

V. Comments for CVE-2021-32674

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