Attackers have been exploiting critical Zimbra flaw to steal emails
摘要
微软警告，攻击者正利用Zimbra协作套件中的一个关键漏洞，试图获取受影响组织的邮件备份和身份验证凭据。该漏洞编号为CVE-2026-73570，允许攻击者未经身份验证远程执行操作系统命令。Zimbra维护方Synacor于7月20日发布补丁，但此后三周多未披露该漏洞。Shadowserver基金会称已发现274个实例遭入侵，目前追踪约1万台相关服务器。微软
Hackers have been exploiting a critical vulnerability in the Zimbra Collaboration Suite in an attempt to obtain email backups and authentication credentials of vulnerable organzations, Microsoft has warned.
The vulnerability, tracked as CVE-2026-73570, lets attackers remotely issue operating system commands without authentication. Zimbra maintainer Synacor issued a patch on July 20, but didn’t disclose the vulnerability for more than three weeks after that. The security-focused Shadowserver Foundation said last week that its scans found that 274 separate instances of the Zimbra Collaboration Suite had been compromised. The number of servers running the software has fluctuated from 19,000 in the week following the patch to about 12,000 in the weeks following that. Currently, Shadowserver is tracking about 10,000 instances.
Look, ma, no authorization
From July 28 to August 7, Microsoft said Wednesday, the company detected two distinct scanning tools probing the Internet for vulnerable endpoints. The attackers first validated their exploit worked by sending HTTP, requests and DNS, ICMP, and out-of-band identity checks to domains hosted on public services. The probes allowed the attackers to confirm the exploit successfully executed commands on vulnerable servers without actually compromising them. Eventually, the attackers began using their command injection capability to install malicious payloads. Microsoft wrote:
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