When using Apache Knox SSO prior to 1.6.1, a request could be crafted to redirect a user to a malicious page due to improper URL parsing. A request that included a specially crafted request parameter could be used to redirect the user to a page controlled by an attacker. This URL would need to be presented to the user outside the normal request flow through a XSS or phishing campaign.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-42357
• https://lists.apache.org/thread/b7v5dkpyqb51nw0lvz4cybhgrfhk1g7j
• http://www.openwall.com/lists/oss-security/2022/01/17/2