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CVE-2022-31132— Unauthenticated SSRF in 3rd party module "cerdic/csstidy"

Quick assessment

Affected
nextcloud security-advisories
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.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Mail存在代码问题漏洞，该漏洞源于对 minifier 的访问不受限制。攻击者利用该漏洞执行服务器端请求伪造攻击。

CVSS 8.3 · High EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-31132

Vulnerability Information
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Vulnerability Title
Unauthenticated SSRF in 3rd party module "cerdic/csstidy"
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Mail is an email application for the nextcloud personal cloud product. Affected versions shipped with a CSS minifier on the path `./vendor/cerdic/css-tidy/css_optimiser.php`. Access to the minifier is unrestricted and access may lead to Server-Side Request Forgery (SSRF). It is recommendet to upgrade to Mail 1.12.7 or Mail 1.13.6. Users unable to upgrade may manually delete the file located at `./vendor/cerdic/css-tidy/css_optimiser.php`
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Mail存在代码问题漏洞，该漏洞源于对 minifier 的访问不受限制。攻击者利用该漏洞执行服务器端请求伪造攻击。
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
nextcloud security-advisories < 1.12.8 -

II. Public POCs for CVE-2022-31132

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III. Intelligence Information for CVE-2022-31132

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Vendor Advisories for CVE-2022-31132 (1)

Same Patch Batch · nextcloud · 2022-08-04 · 4 CVEs total

CVE-2022-31118 6.5 MEDIUM Missing brute force protection on cloud federation sharing in Nextcloud Server
CVE-2022-31119 3.1 LOW Password disclosure in log file in Nextcloud Mail App
CVE-2022-31120 2.1 LOW Federated share accepting/declining is not logged in audit log in Nextcloud Server

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-918

V. Comments for CVE-2022-31132

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