and interact with internal services that are otherwise restricted. Map internal networks and leak sensitive information. Current Threat Landscape
Recommendations for to catch XSS attempts. Let me know which technical step you want to tackle first! Share public link
While 2020 saw several high-profile vulnerabilities in Zimbra (notably CVE-2020-27988 and CVE-2020-28016), one flaw stands out for its severity and the chilling simplicity of its exploitation: . This vulnerability, rated Critical (CVSS 9.8) , allows an unauthenticated attacker to achieve full Remote Code Execution (RCE) on the underlying Zimbra server, leading to complete compromise of the email infrastructure.
: After patching, run zmcontrol -v to confirm the patch level and monitor application logs for any unusual post-upgrade behavior.
Update the repository metadata: yum clean metadata && yum check-update Update your system: yum update Restart ZCS: su - zimbra -c "zmcontrol restart" 2. Manual Workaround cve20207796 zimbra collaboration suite full
The specific flaw is a vulnerability. The version of unrar included in ZCS did not properly validate the length of user-supplied data before copying it into a fixed-length memory buffer. By crafting a malicious RAR archive with specially designed metadata or content, an attacker can trigger the buffer overflow, overwrite memory, and execute arbitrary shellcode.
An attacker uploads a file titled alert(document.cookie) .txt .
An attacker can exploit this vulnerability by sending a crafted HTTP request to the vulnerable endpoint, which can lead to the execution of arbitrary code on the system. This can allow the attacker to gain unauthorized access to sensitive data, disrupt email services, or even take control of the entire system.
Configure a Web Application Firewall (WAF) or Intrusion Prevention System (IPS) to detect and drop suspicious traffic patterns directed at the Zimlet JSP endpoints, dropping requests that incorporate internal or loopback IP structures within query arguments. Zimbra Collaboration Suite SSRF (CVE-2020-7796) - Acunetix and interact with internal services that are otherwise
Attackers can intercept response contents from internal services to leak sensitive data back to external infrastructure. Affected Configurations
is a critical Server-Side Request Forgery (SSRF) vulnerability in Synacor Zimbra Collaboration Suite (ZCS) that allows unauthenticated remote attackers to force the server into making arbitrary HTTP requests. This flaw presents a severe security risk to enterprise environments, carrying a maximum CVSS v3.1 score of 9.8 (Critical) .
Zimbra (Synacor) acted quickly to address this issue, releasing patches in late 2020. To secure a Zimbra Collaboration Suite instance against CVE-2020-7796, administrators must take the following steps:
An attacker sends a specially crafted HTTP request to the vulnerable Zimbra server. Because the server trusts requests made by its own Zimlets, the application acting as a proxy sends a request to an internal target (like a database, administrative interface, or cloud metadata service) or an external target. Why is this Critical? Let me know which technical step you want to tackle first
Attackers use the Zimbra server to scan local IP ranges and map hidden internal ports behind corporate firewalls.
An unauthenticated attacker with network access can exploit this SSRF to achieve several malicious objectives:
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