X-Forwarded-Host Overrides Host in ZCS 8.8.15/9.0 ProxyServlet - Host Hijack
CVE-2022-37041 Published on August 12, 2022
An issue was discovered in ProxyServlet.java in the /proxy servlet in Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0. The value of the X-Forwarded-Host header overwrites the value of the Host header in proxied requests. The value of X-Forwarded-Host header is not checked against the whitelist of hosts that ZCS is allowed to proxy to (the zimbraProxyAllowedDomains setting).
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