PT-2023-8427 · Nextcloud+2 · Nextcloud Server+2

Nickvergessen · Published 2023-03-27 · Updated 2025-03-03 · CVE-2023-25818

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:S/C:P/I:C/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions prior to 24.0.10 Nextcloud Server versions prior to 25.0.4

Description The issue is related to the lack of authentication attempt limits in Nextcloud Server, allowing a malicious user to try to reset another user's password and then brute force the password reset token. Although brute forcing the 62^21 combinations for the password reset token would require significant compute resources, it is still a potential risk. There are no known real-world incidents or estimated numbers of affected devices mentioned.

Recommendations For versions prior to 24.0.10, upgrade to 24.0.10. For versions prior to 25.0.4, upgrade to 25.0.4. As a temporary workaround, consider implementing throttling for password reset attempts, similar to the fix introduced in commit 704eb3aa, until a patch is available.

Exploit

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-307

Related Identifiers

ALT-PU-2023-1517

ALT-PU-2023-1547

BDU:2024-00711

CVE-2023-25818

GHSA-V243-X6JC-42MP

Affected Products

Alt Linux

Nextcloud Server

Red Os

References · 30

• 🔥 https://github.com/rapid7/metasploit-framework/commit/c598d8b4b00581ff801cdcb3e79f8de056adf6b8 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25818.json · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25820.json · Exploit
• https://github.com/nextcloud/server/pull/36489/commits/704eb3aa6cecc0a646f5cca4290b595f493f9ed3 · Patch
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v243-x6jc-42mp · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-26482 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-25818 · Security Note
• https://bdu.fstec.ru/vul/2023-02259 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-30539 · Security Note
• https://bdu.fstec.ru/vul/2024-00711 · Security Note
• https://bdu.fstec.ru/vul/2023-02258 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-28847 · Security Note
• https://errata.altlinux.org/ALT-PU-2023-1547 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-28835 · Security Note
• https://osv.dev/vulnerability/CVE-2023-25818 · Vendor Advisory