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CVE-2023-49792— Bruteforce protection can be bypassed with misconfigured proxy

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 Server存在安全漏洞，该漏洞源于当代理配置为受信任代理时，服务器可能会被诱骗为攻击者读取错误的远程地址，从而允许执行超出预期的身份验证尝试。

CVSS 5.3 · Medium EPSS 1.04% · P63

Possible ATT&CK Techniques 1 AI

T1110.001 · Password Guessing
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I. Basic Information for CVE-2023-49792

Vulnerability Information
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Vulnerability Title
Bruteforce protection can be bypassed with misconfigured proxy
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when a (reverse) proxy is configured as trusted proxy the server could be tricked into reading a wrong remote address for an attacker, allowing them executing authentication attempts than intended. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
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 Server存在安全漏洞，该漏洞源于当代理配置为受信任代理时，服务器可能会被诱骗为攻击者读取错误的远程地址，从而允许执行超出预期的身份验证尝试。
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 >= 23.0.0, < 23.0.12.13 -

II. Public POCs for CVE-2023-49792

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III. Intelligence Information for CVE-2023-49792

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Patches & Fixes for CVE-2023-49792 (1)

Vendor Advisories for CVE-2023-49792 (1)

Other References for CVE-2023-49792 (1)

Same Patch Batch · nextcloud · 2023-12-22 · 3 CVEs total

CVE-2023-49791 5.4 MEDIUM Workflows do not require password confirmation on API level
CVE-2023-49790 4.3 MEDIUM App PIN code can be bypassed in Nextcloud Files iOS

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-307

V. Comments for CVE-2023-49792

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