CVE-2026-103507 in P4 Search
Summary
by MITRE • 10/05/2026
Perforce P4 Search prior to 2026.4.2 does not restrict file paths written through its logging configuration interface. An attacker holding the service authentication token can write arbitrary files on the host, potentially leading to code execution as the P4 Search service account.
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Analysis
by VulDB Data Team • 10/05/2026
The vulnerability identified in Perforce P4 Search versions prior to 2026.4.2 represents a critical security flaw rooted in insufficient input validation within the logging configuration interface. This component is designed to manage how system events and search operations are recorded, typically involving parameters that define log file paths or destinations. In vulnerable iterations of the software, the application fails to properly sanitize or restrict the file path strings provided by users through this administrative interface. Specifically, there is no adequate enforcement of directory traversal restrictions or canonicalization checks on these input fields. This architectural oversight allows an actor with valid service authentication credentials to manipulate where log data is written on the underlying operating system filesystem. The absence of strict boundary controls means that relative paths containing sequence characters for moving up directories can be processed without rejection, enabling access to arbitrary locations outside the intended logging directory structure.
From a technical perspective, this flaw constitutes an unrestricted file write vulnerability, which aligns with Common Weakness Enumeration (CWE) category CWE-434: Unrestricted Upload of File with Dangerous Type or CWE-22: Improper Limitation of a Pathname to a Restricted Directory depending on the specific exploitation vector. The core issue lies in the failure to validate that the destination path remains within an allowed sandboxed area designated for log files. When an authenticated user submits a crafted file path, such as one containing ../ sequences or absolute paths pointing to system directories like /etc/ or C:\Windows\System32\, the application accepts and processes this input without verifying its safety. This lack of validation permits the writing of arbitrary data to any location on the host machine where the P4 Search service process has write permissions. Given that services often run with elevated privileges to perform system-level tasks effectively, this capability significantly expands the potential blast radius of a compromised account.
The operational impact of this vulnerability is severe due to its direct pathway to remote code execution. By writing arbitrary files to specific locations on the host operating system, an attacker can place malicious scripts or binaries in directories that are monitored by scheduled tasks, startup processes, or other automated systems running under the same service account context. For instance, if the attacker writes a script to a location executed periodically by the P4 Search service process, they achieve code execution with the privileges of that service account. This effectively bypasses traditional authentication and authorization controls because the exploitation relies on legitimate administrative actions performed within an authenticated session rather than exploiting a network-facing injection flaw or breaking out of a sandbox. The attacker does not need to exploit additional vulnerabilities in the operating system kernel; instead, they leverage the trust relationship between the application logic and the file system permissions granted to the service account.
This vulnerability maps directly to several techniques defined in the MITRE ATT&CK framework, particularly those related to persistence and privilege escalation. It aligns with T1505: Server Software Component, where attackers install or modify components such as log files that are executed by other processes. Furthermore, it relates to T1036: Masquerading if the written file is disguised as a legitimate system component, and potentially T1059: Command and Scripting Interpreter if shell scripts or executable binaries are deployed for execution. The ability to write arbitrary files essentially grants the attacker full control over the host environment relative to the service account's permissions, allowing them to establish persistent backdoors, harvest credentials stored in configuration files, or pivot further into the network using the compromised server as a foothold.
Mitigation strategies must focus on immediate patching and defensive coding practices. The primary remediation is to upgrade Perforce P4 Search to version 2026.4.2 or later, where this input validation flaw has been addressed by developers implementing strict path canonicalization and directory restriction checks. Until the update can be applied in production environments, administrators should enforce principle of least privilege for the service account running P4 Search. This involves configuring the operating system to restrict write access to critical directories such as system folders or startup paths, ensuring that even if an attacker writes a file there, it cannot be executed automatically by other high-privilege processes. Additionally, implementing strict input validation at the application layer is crucial for future development; all user-supplied path inputs must be validated against a whitelist of allowed directories and sanitized to remove any directory traversal sequences before being processed by the logging subsystem. Regular auditing of file system changes in sensitive areas can also aid in early detection of such exploitation attempts.