CVE-2026-108361 in ra-tls-clients
Summary
by MITRE • 10/12/2026
Privasys Remote Attestation TLS Clients provides multi-language utilities for verifying attested TLS connections. Before 0.9.1, an attacker with local access could modify workload code, data, and configuration at any time after successful connection establishment. Once Evidence was successfully appraised and the connection was established, there was a window of vulnerability from the establishment of the connection to the termination of the connection where an attacker could modify the state of the workload and platform at runtime on the TLS endpoint acting as the Attester. This vulnerability was possible because Privasys/ra-tls-clients performed attestation only once in the lifetime of the connection (at connection establishment time), and the verifying peer continued to believe that the state was the same as in the initial Evidence throughout, whereas it could be stale at some point in time. This vulnerability is fixed in 0.9.1.
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Analysis
by VulDB Data Team • 10/12/2026
The Privasys Remote Attestation TLS Clients utility provides multi-language tools designed to verify attested Transport Layer Security connections, ensuring that communicating parties can trust the integrity of their peers based on cryptographic evidence of system state. In versions prior to 0.9.1, a critical architectural flaw existed within the lifecycle management of these secure sessions. The vulnerability stems from the fact that remote attestation was performed exclusively at the moment of connection establishment. Once the initial Evidence was successfully appraised and the TLS handshake completed, the verifying peer assumed that the integrity state reported in that initial evidence remained valid for the entire duration of the session. This design decision created a significant window of exposure where trust was static rather than dynamic relative to runtime changes on the endpoint acting as the Attester.
An attacker with local access privileges could exploit this gap by modifying workload code, data, or configuration parameters after the connection had been successfully established but before it terminated. Because the system did not re-evaluate the integrity of the environment during active communication, the verifying peer continued to operate under the assumption that the remote endpoint remained in its originally attested state. This allowed for runtime manipulation where an attacker could alter sensitive data or inject malicious logic into running processes without triggering a new attestation check. The core issue is not with the TLS protocol itself but with the application-layer trust model which failed to account for post-establishment integrity drift, effectively rendering the initial security guarantees obsolete once the session was active.
From a technical classification perspective, this vulnerability aligns closely with CWE-362, Concurrent Execution using Shared Resource with Improper Synchronization of 'Race Conditions', specifically in the context of state verification lagging behind actual system changes. It also relates to CWE-1047, Incorrect Object Initialization, as the trust object was initialized once and never refreshed despite potential environmental alterations. In terms of adversary tactics, this flaw facilitates lateral movement and persistence within a trusted network segment by allowing an attacker to compromise the integrity of a secure channel without detection. The MITRE ATT&CK framework categorizes such behavior under techniques involving Defense Evasion or Credential Access if the modified workload is used to exfiltrate data from what was presumed to be a secure, verified connection.
The operational impact of this vulnerability is severe in environments relying on remote attestation for zero-trust networking principles. If an organization assumes that all traffic over these TLS connections originates from a fully compliant and unmodified system, they may inadvertently process malicious commands or leak sensitive information through channels believed to be secure. The lack of continuous verification means that the security boundary dissolves immediately after handshake completion if local privileges are compromised. This undermines the fundamental purpose of remote attestation, which is to provide ongoing assurance about the health and integrity of a device before allowing it access to resources.
To mitigate this risk, organizations must upgrade to version 0.9.1 or later of the Privasys Remote Attestation TLS Clients software immediately. The fix addresses the root cause by implementing mechanisms that ensure the attestation state remains current throughout the connection lifecycle rather than being a one-time validation event. In addition to upgrading, security teams should enforce strict local access controls and monitor for unauthorized modifications to workload configurations during active sessions. Implementing continuous integrity monitoring solutions can provide an additional layer of defense, ensuring that any runtime changes are detected even if the primary attestation mechanism has limitations in frequency or scope. Regular audits of system state against known good baselines further reduce the window of opportunity for such attacks by detecting deviations before they can be exploited within established secure channels.