#VU83565 Improper access control in oauth2 - CVE-2023-49104
Published: November 29, 2023
Vulnerability identifier: #VU83565
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-49104
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
oauth2
oauth2
Software vendor:
ownCloud
ownCloud
Description
The vulnerability allows a remote attacker to bypass subdomain validation.
The vulnerability exists due to improper access restrictions when Allow Subdomains is enabled. A remote attacker can pass in a specially crafted redirect-url which bypasses the validation code and thus allows the attacker to redirect callbacks to a TLD controlled by the attacker.
Remediation
Install updates from vendor's website.