Vulnerability Details 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).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.027
EPSS Ranking 85.2%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5
References
- https://blog.sonarsource.com/zimbra-webmail-compromise-via-email
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23
- https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- https://blog.sonarsource.com/zimbra-webmail-compromise-via-email
- https://wiki.zimbra.com/wiki/Security_Center
- https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23
- https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Products affected by CVE-2021-35209
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cpe:2.3:a:zimbra:collaboration:8.8
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cpe:2.3:a:zimbra:collaboration:8.8.0
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cpe:2.3:a:zimbra:collaboration:8.8.10
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cpe:2.3:a:zimbra:collaboration:8.8.11
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cpe:2.3:a:zimbra:collaboration:8.8.12
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cpe:2.3:a:zimbra:collaboration:8.8.15
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cpe:2.3:a:zimbra:collaboration:8.8.2
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cpe:2.3:a:zimbra:collaboration:8.8.3
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cpe:2.3:a:zimbra:collaboration:8.8.4
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cpe:2.3:a:zimbra:collaboration:8.8.6
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cpe:2.3:a:zimbra:collaboration:8.8.7
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cpe:2.3:a:zimbra:collaboration:8.8.8
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cpe:2.3:a:zimbra:collaboration:8.8.9
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cpe:2.3:a:zimbra:collaboration:9.0.0