#VU18090 Open redirect in mod_auth_mellon - CVE-2019-3877

Vulnerability identifier: #VU18090

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-3877

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mod_auth_mellon
Server applications / Other server solutions

Vendor: UNINETT

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data in the apr_uri_parse() function within the logout URL. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

mod_auth_mellon: 0.4.0 - 0.14.1

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3877
https://github.com/Uninett/mod_auth_mellon/commit/62041428a32de402e0be6ba45fe12df6a83bedb8
https://github.com/Uninett/mod_auth_mellon/issues/35

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.