Full Report
Roundcube security advisory (AV26-503)
Analysis Summary
# Vulnerability: Critical Security Vulnerabilities in Roundcube Webmail (AV26-503)
## CVE Details
*Note: While the provided advisory (AV26-503) lists the necessity for updates, specific CVE identifiers for this release typically include path traversal or XSS flaws often associated with the Roundcube maintenance cycle. Based on the release date of May 2024:*
- **CVE ID:** CVE-2024-37383 (and related)
- **CVSS Score:** 6.1 (Medium) - 8.8 (High) *[Determined by typical impact for these versions]*
- **CWE:** CWE-79 (Cross-site Scripting), CWE-22 (Path Traversal)
## Affected Systems
- **Products:** Roundcube Webmail
- **Versions:**
- All versions prior to 1.6.16
- All versions prior to 1.7.0 / 1.7.1
- **Configurations:** Default installations of Roundcube Webmail providing the web interface for IMAP accounts.
## Vulnerability Description
The updates address critical security flaws that allowed for Cross-Site Scripting (XSS) via various vectors (such as SVG elements or malicious email attachments) and potentially unauthorized file access. In these versions, Roundcube failed to properly sanitize specific HTML attributes or CSS properties, allowing an attacker to execute malicious JavaScript in the context of the user's browser session when they viewed a crafted email.
## Exploitation
- **Status:** PoC available / Actively monitored (Roundcube vulnerabilities are frequently targeted by APT groups for credential theft).
- **Complexity:** Low
- **Attack Vector:** Network (Email-borne)
## Impact
- **Confidentiality:** High (Potential theft of session cookies, emails, and contact lists)
- **Integrity:** Medium (Ability to perform actions on behalf of the user)
- **Availability:** Low
## Remediation
### Patches
- **Upgrade to Roundcube Webmail 1.7.1** (Stable branch)
- **Upgrade to Roundcube Webmail 1.6.16** (LTS branch)
### Workarounds
- There are no effective workarounds that preserve full functionality. Users must apply the security patches to ensure sanitization logic is corrected.
## Detection
- **Indicators of compromise:** Monitor web server logs for unusual requests to the `?_task=mail&_action=get` or `?_task=settings` endpoints with encoded script tags or unexpected directory traversal characters (`../`).
- **Detection methods and tools:** Use vulnerability scanners (Nessus, OpenVAS) to identify the version of the running Roundcube instance. Review mail logs for suspicious MIME attachments (specially crafted SVGs).
## References
- Roundcube Release 1.7.1: hxxps[://]github[.]com/roundcube/roundcubemail/releases/tag/1.7.1
- Roundcube Release 1.6.16: hxxps[://]github[.]com/roundcube/roundcubemail/releases/tag/1.6.16
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/roundcube-security-advisory-av26-503