Safety researchers have uncovered a number of essential vulnerabilities in Versa Concerto, a extensively deployed community safety and SD-WAN orchestration platform utilized by massive enterprises, service suppliers, and authorities entities.
Regardless of accountable disclosure efforts over a 90-day interval, these vulnerabilities stay unpatched, creating important danger for organizations utilizing this platform.
The problems embody authentication bypass flaws, arbitrary file write vulnerabilities, and container escape methods that, when chained collectively, enable attackers to totally compromise each the applying and underlying host system.
Researchers recognized a basic safety flaw in Versa Concerto’s authentication mechanism stemming from inconsistent URL processing.
To know the equipment’s routing, we begin by analyzing the Traefik container. The Traefik container listens on ports 80/443, serving because the entry level for consumer requests. Primarily based on location configurations, incoming requests are routed to both core-service or web-service.
The appliance’s AuthenticationFilter class incorporates a Time-of-Examine to Time-of-Use (TOCTOU) vulnerability the place the REQUEST_URI undergoes URL decoding throughout authentication checks, however stays unencoded when processed by controllers.
This inconsistency permits attackers to bypass authentication utilizing specifically crafted URLs containing encoded path traversal characters.
The exploit leverages paths like /portalapi/v1/customers/username/admin;%2fv1percent2fping the place the semicolon adopted by URL-encoded slashes tips the authentication system.
When the system processes this URL for authentication, it decodes the trail and misidentifies it as an excluded endpoint, granting unauthorized entry.
This vulnerability exposes delicate API endpoints that may usually require correct authentication, offering an entry level for additional assaults.
Chained Exploitation Results in Distant Code Execution
After gaining unauthorized entry, attackers can exploit a weak file add endpoint within the web-service element that enables arbitrary file writes by a race situation vulnerability.
The authentication bypass serves because the preliminary entry level in a subtle assault chain.
Though uploaded recordsdata are rapidly deleted, researchers demonstrated that exactly timed requests might efficiently exploit this window of alternative.
By leveraging this file write functionality, attackers can make use of an LD_PRELOAD method to realize distant code execution.
The exploit entails overwriting /and many others/ld.so.preload with a path to a malicious shared object file concurrently uploaded to /tmp/hook.so.
This malicious object executes when triggered by periodic system instructions, establishing reverse shell entry to the container.
Additional escalation to the host system is feasible by a essential Docker misconfiguration.
The container has /usr/bin/ and /bin/ directories mapped on to the host’s filesystem, permitting attackers to switch system binaries with malicious variations that execute when triggered by scheduled cron jobs like /and many others/cron.d/popularity-contest.
CVE Assignments and Momentary Mitigation Measures
After a number of unsuccessful makes an attempt to obtain patches from Versa, VulnCheck assigned three CVEs to the vulnerabilities: CVE-2025-34025 for the Docker container escape, CVE-2025-34026 for the actuator authentication bypass, and CVE-2025-34027 for the authentication bypass resulting in distant code execution.
In keeping with the Report, Organizations utilizing Versa Concerto ought to implement speedy mitigations at their proxy or WAF layer: block requests containing semicolons in URL paths to forestall the authentication bypass, and drop requests with Connection headers containing “X-Actual-Ip” values to guard actuator endpoints.
These short-term measures can scale back exploitation dangers whereas awaiting official patches.
The disclosure timeline started on February 13, 2025, with researchers offering full particulars to Versa.
Regardless of preliminary acknowledgment and guarantees of patches by April seventh, no fixes had been delivered by the 90-day disclosure deadline on Might thirteenth, 2025.
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