Cross-Site Request Forgery (CSRF) in Synacor Zimbra Collaboration Suite (CVE-2016-3403)
Summary
Vulnerability in Synacor Zimbra Collaboration Suite (CVE-2016-3403). Successful exploitation can lead to full system takeover. Exploitable via Referer header.
Original description
The description as published by the source.
Multiple cross-site request forgery (CSRF) vulnerabilities in the Admin Console in Zimbra Collaboration before 8.6.0 Patch 8 allow remote attackers to hijack the authentication of administrators for requests that (1) add, (2) modify, or (3) remove accounts by leveraging failure to use of a CSRF token and perform referer header checks, aka bugs 100885 and 100899.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2016-3403 has been found in Synacor Zimbra Collaboration Suite.
Attackers can target a specific entry point like Referer header over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Synacor Zimbra Collaboration Suite CVE-2016-3403" on the vendor's site.
CVE-2016-3403 (Synacor Zimbra Collaboration Suite) — CWE-352 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: Referer header
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
CSRF (CWE-352) exists in Synacor Zimbra Collaboration Suite. Attackers reach the vulnerable code path via Referer header without authentication.
Check the vendor advisory for the affected versions of Synacor Zimbra Collaboration Suite. Attack surface: Referer header.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Synacor Zimbra Collaboration Suite を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- advisory securityfocus.com
- exploit seclists.org
- exploit sysdream.com
- issue bugzilla.zimbra.com
- issue bugzilla.zimbra.com
- patch wiki.zimbra.com
- patch wiki.zimbra.com
- web wiki.zimbra.com