Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists within the file extraction process of Zimbra Collaboration Suite. This flaw allows for the upload of arbitrary files, which can then lead to unauthorized access to other user accounts. The core issue stems from a loophole in how certain archive files are handled, potentially exposing sensitive information across different user accounts.
- Vulnerable file extraction feature
- Arbitrary file upload via archive loophole
- Unauthorized access to user accounts
Attack Path
How an attacker could exploit the issue
Zimbra Collaboration Suite versions 8.8.15 and 9.0 are susceptible to an arbitrary file upload vulnerability. This flaw exists within the amavis component due to a cpio loophole, allowing an attacker to extract files to a location that could grant unauthorized access to other user accounts. This vulnerability is classified as external, meaning it can be exploited over a network.
- Unrestricted file upload exposure.
- Attacker uploads malicious file.
- Gain access to other accounts.
Live Threat
Current exploitation, exposure, and threat context
An attacker can upload arbitrary files through amavis via a cpio loophole in Zimbra Collaboration Suite. This vulnerability can lead to incorrect access to other user accounts. The issue is related to file extraction capabilities and the preference for certain archiving tools on different operating systems.
- Attackers with low skill level.
- No access or conditions required.
- High business risk or urgency.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Zimbra Collaboration Suite enables an attacker to upload arbitrary files, potentially leading to unauthorized access to user accounts. The vulnerability stems from a file extraction loophole within the amavis service. Organizations utilizing affected versions should prioritize identifying and mitigating exposure to this risk.
- Locate all instances of Zimbra Collaboration Suite.
- Isolate affected systems or reduce external access.
- Apply vendor updates, verify, and monitor.
