by Kastro
Paper/Archive/CVE-2023-49792

CVE-2023-49792

nextcloud security-advisories — Bruteforce protection can be bypassed with misconfigured proxy

EPSS 1%CVSS 9.8
critical.is priorityof 100
42
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 64.1.641 × 2012.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
security-advisories>= 23.0.0, < 23.0.12.13–CNA
security-advisories>= 24.0.0, < 24.0.12.9–CNA
security-advisories>= 25.0.0, < 25.0.13.4–CNA
security-advisories>= 26.0.0, < 26.0.9–CNA
security-advisories>= 27.0.0, < 27.1.4–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/nextcloud/security-advisories/security/advisories/GHSA-5j2p-q736-hw98refgithub.com/nextcloud/server/pull/41526refhackerone.com/reports/2230915