SSRF in Zimbra Collaboration
CVE-2021-35209
An issue was discovered in ProxyServlet.java in the /proxy servlet in Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.x before 9.0.0 Patch 16. The value of the X-Host header overwrites the value of the Host header in proxied requests. The value of X-Host header is not checked against the whitelist of hosts Zimbra is allowed to proxy to (the zimbraProxyAllowedDomains setting).
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS 0.030, 87.5th percentile (scored ); unchanged over 30 days. About EPSS.
Affected products
- Zimbra Collaboration — versions 8.8.15, 9.0.0
Weakness classification (CWE)
Public exploits and proof-of-concept code
Also mentioned in 2 other repositories (20142995/nuclei-templates, cyb3r-w0lf/nuclei-template-collection). These reference the CVE in a list, notes or a scanner and are not exploit code for it.
References
- wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
- wiki.zimbra.com/wiki/Security_Center (Release Notes, Vendor Advisory)
- wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16 (Release Notes, Vendor Advisory)
- wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23 (Release Notes, Vendor Advisory)
- blog.sonarsource.com/zimbra-webmail-compromise-via-email (Exploit, Third Party Advisory)