Multiple vulnerabilities in Nextcloud Server and Enterprise Server
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2023-48306 CVE-2023-48304 |
| CWE-ID | CWE-918 CWE-639 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Nextcloud Enterprise Server Client/Desktop applications / Messaging software Nextcloud Server Client/Desktop applications / Messaging software |
| Vendor | Nextcloud |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Server-Side Request Forgery (SSRF)
EUVDB-ID: #VU83359
Risk: Medium
CVSSv3.1: 4.4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-48306
CWE-ID:
CWE-918 - Server-Side Request Forgery (SSRF)
Exploit availability: No
DescriptionThe disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input in DNS pin middleware. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNextcloud Enterprise Server: 22.0.0 - 27.0.2
Nextcloud Server: 25.0.0 - 27.0.2
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-8f69-f9jg-4x3v
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Authorization bypass through user-controlled key
EUVDB-ID: #VU83361
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-48304
CWE-ID:
CWE-639 - Authorization Bypass Through User-Controlled Key
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to the authorization bypass through user-controlled key. A remote user can enable and disable the birthday calendar for any user on the same server.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNextcloud Enterprise Server: 22.0.0 - 27.0.2
Nextcloud Server: 25.0.0 - 27.0.2
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-8jwv-c8c8-9fr3
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
