CVE-2025-0642 Overview
CVE-2025-0642 affects PosCube Hardware Software and Consulting Ltd. Co. Assist, a point-of-sale support application. The vulnerability combines two distinct weaknesses: use of hard-coded credentials and authorization bypass through a user-controlled key [CWE-639]. Attackers can leverage these flaws to bypass authentication and access data belonging to other users. The issue affects all versions of Assist through the 10.02.2025 release.
Critical Impact
An authenticated low-privilege attacker can bypass authorization controls by manipulating user-controlled key parameters, exposing confidential data across tenant boundaries.
Affected Products
- PosCube Assist through 10.02.2025
Discovery Timeline
- 2025-10-02 - CVE-2025-0642 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-0642
Vulnerability Analysis
The vulnerability chains two weaknesses in PosCube Assist. First, the application ships with hard-coded credentials that are identical across deployments. Second, the application uses a user-controlled key to reference sensitive resources without validating that the requester owns the object. This pattern is classified as Insecure Direct Object Reference (IDOR) under [CWE-639].
An attacker with low privileges and the ability to influence a user (UI:R) can substitute another user's identifier in a request. The backend returns the referenced resource without performing a server-side ownership check. The combined weakness enables account impersonation and data excavation without exploiting a memory-safety issue.
Root Cause
The root cause is missing authorization enforcement at the object level. The application trusts client-supplied identifiers to select records, and it relies on shared static credentials for internal authentication flows. Neither the credential material nor the identifier is validated against the authenticated session context.
Attack Vector
Exploitation occurs over the network with low attack complexity. The attacker requires low-level privileges on the target system and must induce user interaction to complete the attack chain. Successful exploitation results in high impact to confidentiality and low impact to integrity. See the Turkish USOM Notification TR-25-0309 for coordinated disclosure details.
No public proof-of-concept code has been released. The vulnerability manifests when the client submits a modified key parameter that references a resource owned by a different account, and the server returns that resource without authorization verification.
Detection Methods for CVE-2025-0642
Indicators of Compromise
- Access log entries showing rapid enumeration of sequential or predictable identifier values in API request parameters.
- Authentication events using the vendor's default or hard-coded service account from unexpected source addresses.
- Cross-account data access patterns where a single session retrieves records associated with multiple distinct user identifiers.
Detection Strategies
- Deploy application-layer monitoring to correlate the authenticated user identity with the object identifiers referenced in each request.
- Alert on sessions that request resources outside the requester's assigned tenant or user scope.
- Baseline normal identifier access patterns per user and flag statistical outliers indicative of enumeration.
Monitoring Recommendations
- Forward PosCube Assist application logs and web server access logs to a centralized analytics platform for correlation.
- Monitor for the use of any credentials distributed as vendor defaults across the customer environment.
- Track HTTP response sizes and status codes for endpoints accepting user-controlled keys to identify successful unauthorized reads.
How to Mitigate CVE-2025-0642
Immediate Actions Required
- Contact PosCube Hardware Software and Consulting Ltd. Co. to obtain a fixed release of Assist beyond version 10.02.2025.
- Rotate any credentials associated with the affected deployment and remove default or shared service accounts.
- Restrict network access to the Assist application to trusted management networks until a patched build is deployed.
Patch Information
PosCube has not published a public advisory URL identifying the fixed version. Consult the Siber Güvenlik Notification TR-25-0309 and coordinate directly with the vendor for a patched release that addresses both the hard-coded credential and the authorization bypass.
Workarounds
- Enforce network-level access controls that limit which clients can reach the Assist application endpoints.
- Place the application behind a web application firewall configured to inspect and constrain user-controlled identifier parameters.
- Implement session-aware reverse proxy rules that reject requests where the object identifier does not match the authenticated principal.
# Example WAF rule concept to block cross-user identifier substitution
# Reject requests where the userId parameter does not match the session claim
SecRule REQUEST_URI "@rx /assist/api/user/(\d+)" \
"id:1000642,phase:2,deny,status:403,\
chain,msg:'CVE-2025-0642 IDOR attempt'"
SecRule TX:1 "!@streq %{SESSION.user_id}"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.