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CVE-2022-31118— Missing brute force protection on cloud federation sharing in Nextcloud Server

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 22.2.9之前版本、23.0.6之前版本和24.0.2之前版本存在安全漏洞，该漏洞源于攻击者可以通过暴力破解查找是否正在使用联合共享，并有可能试图暴力破解联合共享的访问令牌。

CVSS 6.5 · Medium EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1110.001 · Password Guessing
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I. Basic Information for CVE-2022-31118

Vulnerability Information
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Vulnerability Title
Missing brute force protection on cloud federation sharing in Nextcloud Server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source personal cloud solution. In affected versions an attacker could brute force to find if federated sharing is being used and potentially try to brute force access tokens for federated shares (`a-zA-Z0-9` ^ 15). It is recommended that the Nextcloud Server is upgraded to 22.2.9, 23.0.6 or 24.0.2. Users unable to upgrade may disable federated sharing via the Admin Sharing settings in `index.php/settings/admin/sharing`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全漏洞
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 22.2.9之前版本、23.0.6之前版本和24.0.2之前版本存在安全漏洞，该漏洞源于攻击者可以通过暴力破解查找是否正在使用联合共享，并有可能试图暴力破解联合共享的访问令牌。
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 < 22.2.9 -

II. Public POCs for CVE-2022-31118

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III. Intelligence Information for CVE-2022-31118

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Patches & Fixes for CVE-2022-31118 (1)

Vendor Advisories for CVE-2022-31118 (1)

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

CVE-2022-31132 8.3 HIGH Unauthenticated SSRF in 3rd party module "cerdic/csstidy"
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-770

V. Comments for CVE-2022-31118

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