CVE-2025-27673 Overview
CVE-2025-27673 affects Vasion Print (formerly PrinterLogic) deployments running Virtual Appliance Host versions prior to 22.0.843 and Application versions prior to 20.0.1923. The product transmits session cookie data inside HTTP response bodies, exposing authentication material to anyone who can read or intercept those responses. The issue is tracked internally by the vendor as OVE-20230524-0017 and maps to [CWE-539: Use of Persistent Cookies Containing Sensitive Information]. Attackers who obtain the exposed cookies can hijack authenticated sessions and act with the privileges of the targeted user.
Critical Impact
Network-reachable attackers can capture session cookies from response bodies and impersonate authenticated users, including administrators, without credentials or user interaction.
Affected Products
- PrinterLogic Vasion Print Virtual Appliance Host before 22.0.843
- PrinterLogic Vasion Print Application before 20.0.1923
- Legacy PrinterLogic deployments sharing the same code base
Discovery Timeline
- 2025-03-05 - CVE-2025-27673 published to NVD
- 2025-04-01 - Last updated in NVD database
Technical Details for CVE-2025-27673
Vulnerability Analysis
The vulnerability stems from the Vasion Print web application embedding session cookie values directly within HTTP response bodies instead of confining them to Set-Cookie headers protected by HttpOnly and Secure attributes. Any actor with access to the response stream can extract the cookie and replay it. This includes attackers on the same network segment, malicious proxies, browser extensions, and client-side scripts able to read response content. Because the affected endpoints serve administrative and user functions, captured cookies grant access proportional to the victim's role.
The weakness is classified under [CWE-539] and aligns with the OWASP guidance against exposing session identifiers outside protected header channels. The flaw breaks the confidentiality and integrity guarantees of the session management layer and undermines defenses such as HttpOnly, which only apply when cookies travel through headers.
Root Cause
The application's authentication response handler writes cookie content into the body payload returned to clients. This design choice predates the affected releases and remained until the vendor introduced the fixed Virtual Appliance Host 22.0.843 and Application 20.0.1923 builds. Logging, debugging, and intermediate caching layers further amplify exposure because they routinely capture response bodies but typically scrub headers.
Attack Vector
An unauthenticated attacker with network access to the Vasion Print interface can trigger requests that return responses containing valid session cookies. The attacker reads the body, extracts the cookie value, and submits it on subsequent requests to authenticate as the originating user. Exploitation requires no privileges, no user interaction, and low attack complexity. Where the appliance is exposed beyond the management network, the attack surface includes any reachable client on the internet or untrusted internal segments.
No verified public exploit code is available for this issue. Refer to the PrinterLogic Security Bulletins for vendor technical context.
Detection Methods for CVE-2025-27673
Indicators of Compromise
- HTTP response bodies from Vasion Print endpoints containing strings resembling session cookie names or base64-encoded session tokens.
- Authenticated sessions originating from IP addresses that never completed a login flow against the appliance.
- Concurrent active sessions for the same user account from geographically inconsistent sources.
- Administrative actions performed shortly after anomalous read requests to authentication or status endpoints.
Detection Strategies
- Inspect web server and reverse proxy logs for response bodies returned by Vasion Print containing cookie-shaped values, then correlate with subsequent requests reusing those values.
- Compare session cookie issuance events with successful login events; sessions appearing without a preceding authentication should be treated as suspicious.
- Deploy network-based content inspection to flag responses from the appliance that include cookie material in the payload.
Monitoring Recommendations
- Forward Vasion Print appliance logs, reverse proxy logs, and authentication telemetry to a central analytics platform for correlation.
- Monitor for spikes in session creation, privilege changes, and printer configuration modifications originating from unfamiliar source addresses.
- Alert on requests to administrative URIs that bypass interactive login redirects.
How to Mitigate CVE-2025-27673
Immediate Actions Required
- Upgrade Virtual Appliance Host to 22.0.843 or later and Application to 20.0.1923 or later as documented in the vendor advisory.
- Invalidate all existing sessions and force re-authentication after patching.
- Restrict network exposure of the Vasion Print management interface to trusted administrative networks.
- Rotate any administrative credentials that may have been used during the exposure window.
Patch Information
Vasion has addressed the issue in Virtual Appliance Host 22.0.843 and Application 20.0.1923. Customers should review the PrinterLogic Security Bulletins for upgrade packages and release notes covering OVE-20230524-0017.
Workarounds
- Place the appliance behind a reverse proxy that strips or rewrites response payloads containing cookie material until patching completes.
- Enforce mutual TLS or VPN-only access to the management interface to limit who can observe responses.
- Shorten session lifetimes and require re-authentication for sensitive operations to reduce the value of stolen cookies.
# Example: restrict appliance access to an administrative subnet using iptables
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
