XPC Privileged Helper PID Reuse Race Condition

Slate Digital Connect 1.37.0 for macOS installs a privileged helper tool, com.slatedigital.connect.privileged.helper.tool, which exposes the XPC service com.slatedigital.connect.privileged.helper.tool2. The helper validates connecting XPC clients by obtaining the client's process identifier and using it to retrieve code-signing information for the process. This PID-based client validation is subject to a time-of-check time-of-use race condition because process identifiers can be reused. A local attacker can exploit PID reuse so that validation is performed against a trusted process instead of the original connecting process. This allows unauthorized access to privileged helper functionality and may lead to local privilege escalation.

Casky was already ahead

This CVE exploits attack patterns that Casky's 203matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Slate Digital Connect 1.37.0 for macOS contains a critical privilege escalation vulnerability in its XPC-based privileged helper tool. The vulnerability stems from insecure client validation that relies on process identifiers (PIDs) to authenticate connecting clients and retrieve their code-signing information. Because operating systems regularly reuse PIDs after processes terminate, an attacker can exploit this time-of-check time-of-use (TOCTOU) race condition to impersonate a legitimate client, bypass security checks, and execute arbitrary code with elevated privileges. This affects macOS users running the vulnerable version of Slate Digital Connect, potentially compromising system integrity and enabling lateral movement or privilege escalation attacks on affected machines.

Casky's 203 mapped security skills leverage Claude's extended reasoning to detect the attack patterns associated with this vulnerability across MITRE ATT&CK technique TA0004 (Privilege Escalation). Practitioners using Casky would identify suspicious XPC inter-process communication patterns, rapid process spawning and termination cycles designed to trigger PID reuse, and unexpected code-signing validation failures in system logs. The platform's skills would flag anomalous privileged helper tool invocations, particularly those originating from unsigned or untrusted processes that succeed in authenticating despite failing code-signing verification. Security teams would see findings highlighting the temporal gap between client validation and actual command execution, indicators of process manipulation techniques, and evidence of local privilege escalation attempts targeting the com.slatedigital.connect.privileged.helper.tool2 service.

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GreyNoise Signal

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203 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-24067.

analyzing-cloud-storage-access-patterns

cloud security · low

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analyzing-kubernetes-audit-logs

container security · low

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analyzing-office365-audit-logs-for-compromise

cloud security · low

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MITRE ATT&CK Techniques

TA0004

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