Zimlets are add-on components that extend the core capabilities of the Zimbra Collaboration Suite . In this architecture, the WebEx Zimlet handles proxying requests to external WebEx endpoints. However, because user-supplied URLs are not strictly sanitized or checked against an explicit allowlist, an attacker can bypass intended access restrictions. Mechanism of the SSRF Attack
: Low. No user interaction or specialized session state is required to execute the exploit.
. This vulnerability allows an unauthenticated, remote attacker to coerce the targeted mail server into executing arbitrary HTTP requests to internal or external infrastructure. Because enterprise mail servers sit on a highly trusted boundary within a corporate network, exploiting this security flaw can lead directly to cloud credential theft, internal network mapping, and further remote code execution. 🔍 Technical Analysis of the Vulnerability The Root Cause: Insufficient Input Validation
An unauthenticated attacker with network access can exploit this SSRF to achieve several malicious objectives: cve20207796 zimbra collaboration suite full
Organizations using legacy versions of Zimbra must aggressively monitor their environments to ensure this flaw hasn't been used to deposit persistence mechanisms like web shells. Zimbra-Product-Datasheet.pdf
The vulnerability exists in the way Zimbra Drive processes file metadata. When a user or an attacker uploads a file with a malicious payload in the filename, the system fails to properly escape the characters before rendering them in the web interface.
Monday morning, LogiCore’s email is down. The attacker (simulated by Maya) has: Zimlets are add-on components that extend the core
From port 7071, she fetches:
This article provides a comprehensive overview of CVE-2020-7796, exploring its mechanics, potential impact, and crucial remediation steps. What is CVE-2020-7796?
The vulnerability is classified under . It stems from improper input validation within a specific application extension. Mechanism of the SSRF Attack : Low
| | Details | |-----------------------------|---------------------------------------------------------------------------------------------------------------------| | CVE ID | CVE-2020-7796 | | Vulnerability Type | Server-Side Request Forgery (SSRF) | | CWE | CWE-918 | | CVSS v3.1 Score | 9.8 (Critical) | | Attack Vector | Network | | Attack Complexity | Low | | Privileges Required | None | | User Interaction | None | | Affected Software | Zimbra Collaboration Suite (ZCS) versions before 8.8.15 Patch 7 | | Root Cause | Insufficient input validation in the WebEx zimlet's JSP component | | Prerequisite | WebEx zimlet installed and its JSP functionality enabled | | Exploitation Status | Actively exploited in the wild – Confirmed and tracked by CISA | | Patch Availability | Yes (8.8.15 Patch 7 and later) |
/service/proxy?target=https://127.0.0.1:7071/service/admin/soap&ContactEmails=admin@logi-core.local
Specifically, the vulnerable component is a JavaServer Page (JSP) file called httpPost.jsp . This file was designed to handle HTTP requests for the WebEx integration. However, it failed to properly validate user-supplied input, in this case, a URL parameter. The lack of sanitization allowed the httpPost.jsp to make requests to any URL provided in the request.