Full Report
A critical XSS vulnerability, CVE-2024-27443, in Zimbra Collaboration Suite’s CalendarInvite feature is actively being exploited, potentially by the…
Analysis Summary
# Vulnerability: Zimbra Stored Cross-Site Scripting (XSS) Vulnerability
## CVE Details
- CVE ID: CVE-2024-27443
- CVSS Score: *Score and explicit severity ranking are not provided in the source text.*
- CWE: Cross-Site Scripting (XSS)
## Affected Systems
- Products: Zimbra Collaboration Suite
- Versions: Not explicitly stated, but the vulnerability impacts systems running Zimbra that likely require patching.
- Configurations: Instances that have not applied necessary security updates.
## Vulnerability Description
The vulnerability is identified as a Cross-Site Scripting (XSS) flaw. The article specifically names this flaw as CVE-2024-27443 affecting Zimbra. Successful exploitation could allow an attacker to execute arbitrary scripts in the context of a user's browser session.
## Exploitation
- Status: Implied high risk due to widespread impact (129K servers mentioned) and potential attribution to state-sponsored actors (Sednit suspected). *Specific exploitation status (PoC or in-the-wild) is not confirmed, but the scale suggests probable active exploitation or high threat.*
- Complexity: Unknown, but the widespread nature suggests it might be relatively simple once the entry vector is known.
- Attack Vector: Likely network-based, targeting users interacting with the compromised Zimbra web interface.
## Impact
- Confidentiality: High (Potential for session hijacking, credential theft, or data exfiltration via embedded scripts).
- Integrity: High (Potential for modification of user data or actions performed within the victim's session).
- Availability: Low to Medium (Impact on service availability is secondary to data compromise, but widespread XSS could degrade user experience).
## Remediation
### Patches
- Patches are necessary from Zimbra for all affected product versions related to CVE-2024-27443. (Specific patch versions were not listed in the article summary provided.)
### Workarounds
- Workarounds are not detailed in the provided text. Users should rely on vendor guidance for immediate steps if patching is delayed.
## Detection
- Detection focuses on monitoring for unexpected script execution within the Zimbra web client environment. The article hints at potential threat actor involvement (Sednit), suggesting that monitoring for reconnaissance or post-exploitation activity associated with this group might be relevant for compromised environments.
- Indicators of Compromise (IOCs): Not listed.
## References
- Vendor advisories: *Not explicitly linked/defanged in the provided text snippet.*
- Relevant links - defanged:
- hxxps://hackread.com/zimbra-cve-2024-27443-xss-flaw-hit-sednit-servers/