CVE-2017-9832 in libmtp
Summary
by MITRE
An integer overflow vulnerability in ptp-pack.c (ptp_unpack_OPL function) of libmtp (version 1.1.12 and below) allows attackers to cause a denial of service (out-of-bounds memory access) or maybe remote code execution by inserting a mobile device into a personal computer through a USB cable.
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Analysis
by VulDB Data Team • 12/09/2022
The integer overflow vulnerability identified as CVE-2017-9832 resides within the libmtp library version 1.1.12 and earlier, specifically in the ptp-pack.c file within the ptp_unpack_OPL function. This flaw represents a critical security weakness that can be exploited through legitimate USB device connection scenarios, making it particularly dangerous in real-world operational environments where users routinely connect mobile devices to computers. The vulnerability stems from improper handling of integer values during the processing of device property lists, creating a condition where arithmetic operations exceed the maximum representable value for the data type, resulting in unexpected behavior.
The technical implementation of this vulnerability occurs when an attacker crafts a malicious mobile device or manipulates device communication protocols to send malformed data packets through USB connections. The ptp_unpack_OPL function processes device property lists using integer variables that fail to properly validate input boundaries, allowing an attacker to trigger an integer overflow condition. When the overflow occurs, it can cause memory allocation calculations to produce incorrect values, leading to out-of-bounds memory access patterns that may result in application crashes or potentially more severe consequences including remote code execution. This vulnerability operates at the protocol level of the Picture Transfer Protocol (PTP) implementation, making it particularly insidious as it leverages legitimate device communication channels.
The operational impact of CVE-2017-9832 extends beyond simple denial of service conditions, as the potential for remote code execution creates significant risks for system integrity and data confidentiality. Attackers can exploit this vulnerability by simply connecting a compromised device to a target system, eliminating the need for sophisticated network-based attacks or physical access to the system. The attack surface includes any system running libmtp versions 1.1.12 or earlier that accepts USB device connections, encompassing desktop computers, laptops, and servers that handle mobile device transfers. This makes the vulnerability particularly concerning for enterprise environments where USB device management is common, as it can be triggered through legitimate user activities such as connecting smartphones, tablets, or other PTP-compliant devices.
Mitigation strategies for this vulnerability primarily involve immediate version updates to libmtp 1.1.13 or later, which contain patches addressing the integer overflow condition in the affected function. System administrators should implement comprehensive patch management protocols to ensure all affected systems receive updates promptly, particularly in environments where mobile device connectivity is frequent. Additional protective measures include implementing USB device access controls and monitoring for suspicious device connection patterns, as well as considering network segmentation to limit the potential impact of exploitation. The vulnerability aligns with CWE-190, Integer Overflow or Wraparound, and can be mapped to ATT&CK technique T1059.007 for remote code execution through legitimate system interfaces. Organizations should also consider implementing endpoint detection and response solutions to identify potential exploitation attempts, as the vulnerability can be triggered through simple device connection events that may not generate obvious security alerts.