critical
9.8
CWE
918
Advisory Published
Updated

CVE-2021-35209: SSRF

First published: Fri Jul 02 2021(Updated: )

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).

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Zimbra Collaboration>=8.8<8.8.15
Zimbra Collaboration=8.8.15
Zimbra Collaboration=8.8.15-p1
Zimbra Collaboration=8.8.15-p10
Zimbra Collaboration=8.8.15-p11
Zimbra Collaboration=8.8.15-p12
Zimbra Collaboration=8.8.15-p13
Zimbra Collaboration=8.8.15-p14
Zimbra Collaboration=8.8.15-p15
Zimbra Collaboration=8.8.15-p16
Zimbra Collaboration=8.8.15-p17
Zimbra Collaboration=8.8.15-p18
Zimbra Collaboration=8.8.15-p19
Zimbra Collaboration=8.8.15-p2
Zimbra Collaboration=8.8.15-p3
Zimbra Collaboration=8.8.15-p4
Zimbra Collaboration=8.8.15-p5
Zimbra Collaboration=8.8.15-p6
Zimbra Collaboration=8.8.15-p7
Zimbra Collaboration=8.8.15-p8
Zimbra Collaboration=8.8.15-p9
Zimbra Collaboration=9.0.0
Zimbra Collaboration=9.0.0-p1
Zimbra Collaboration=9.0.0-p10
Zimbra Collaboration=9.0.0-p11
Zimbra Collaboration=9.0.0-p12
Zimbra Collaboration=9.0.0-p2
Zimbra Collaboration=9.0.0-p3
Zimbra Collaboration=9.0.0-p4
Zimbra Collaboration=9.0.0-p5
Zimbra Collaboration=9.0.0-p6
Zimbra Collaboration=9.0.0-p7
Zimbra Collaboration=9.0.0-p8
Zimbra Collaboration=9.0.0-p9

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Reference Links

Frequently Asked Questions

  • What is the vulnerability identified as CVE-2021-35209?

    CVE-2021-35209 is an issue 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.

  • What is the severity of CVE-2021-35209?

    The severity of CVE-2021-35209 is critical, with a CVSS score of 9.8.

  • How does CVE-2021-35209 affect Zimbra Collaboration Suite?

    CVE-2021-35209 allows the value of the X-Host header to overwrite the value of the Host header in proxied requests in Zimbra Collaboration Suite.

  • Which versions of Zimbra Collaboration Suite are affected by CVE-2021-35209?

    The vulnerability affects Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.x before 9.0.0 Patch 16.

  • How can I fix CVE-2021-35209 in Zimbra Collaboration Suite?

    To fix CVE-2021-35209, upgrade Zimbra Collaboration Suite to version 8.8.15 Patch 23 or 9.0.0 Patch 16.

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