CVE-2016-10599 in sauce-connect
Summary
by MITRE
sauce-connect is a Node.js wrapper over the SauceLabs SauceConnect.jar program for establishing a secure tunnel for intranet testing. sauce-connect downloads binary resources over HTTP, which leaves it vulnerable to MITM attacks. It may be possible to cause remote code execution (RCE) by swapping out the requested binary with an attacker controlled binary if the attacker is on the network or positioned in between the user and the remote server.
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Analysis
by VulDB Data Team • 02/11/2020
The vulnerability identified as CVE-2016-10599 affects sauce-connect, a Node.js wrapper that facilitates secure tunnel establishment for intranet testing by interfacing with SauceLabs SauceConnect.jar program. This tool serves as a critical component in automated testing environments where developers need to access internal web applications from external testing platforms. The security flaw stems from the application's reliance on unencrypted HTTP connections when downloading binary resources, creating a fundamental weakness in the communication channel between the client and remote servers. This design decision exposes the system to man-in-the-middle attack vectors that can compromise the integrity of the downloaded components.
The technical implementation of this vulnerability involves the use of HTTP protocols for binary resource retrieval rather than secure HTTPS connections, which creates opportunities for attackers positioned within the network traffic path to intercept and manipulate the download process. When sauce-connect attempts to fetch the required SauceConnect.jar binary, the lack of transport layer security means that an attacker can potentially substitute the legitimate binary with a maliciously crafted alternative. This substitution attack can be executed through various network positioning techniques such as ARP spoofing, DNS hijacking, or network traffic interception that allows the malicious actor to present forged content to the client while maintaining the appearance of legitimate communication with the SauceLabs servers.
The operational impact of this vulnerability extends beyond simple data interception, as it can potentially lead to remote code execution within the context of the user's system. When an attacker successfully replaces the legitimate binary with a malicious one, the compromised component could execute arbitrary code during the tunnel establishment process, potentially allowing the attacker to gain unauthorized access to the testing environment, access internal network resources, or escalate privileges within the system. The vulnerability is particularly concerning in enterprise environments where testing infrastructure may have access to sensitive internal systems, making the potential attack surface significantly larger than typical consumer applications.
This vulnerability maps directly to CWE-319, which addresses the exposure of sensitive information through improper use of network communication protocols. The weakness specifically aligns with CWE-319's focus on cryptographic issues in network communication where unencrypted protocols can expose data to interception and manipulation. Additionally, the vulnerability demonstrates characteristics consistent with ATT&CK technique T1059, which involves executing malicious code through compromised software supply chain components. The attack pattern follows the typical MITM exploitation methodology where the attacker positions themselves between the client and server to intercept and modify network traffic. Organizations implementing sauce-connect should consider implementing certificate pinning mechanisms, enforcing HTTPS connections for all binary downloads, and establishing network monitoring to detect anomalous traffic patterns that might indicate compromise attempts.
Mitigation strategies for CVE-2016-10599 should include immediate implementation of secure HTTPS connections for all binary downloads, which would eliminate the man-in-the-middle attack surface by encrypting the communication channel. Organizations should also implement certificate validation mechanisms and consider adopting software supply chain security practices such as checksum verification and digital signatures for all downloaded components. Network administrators should deploy intrusion detection systems to monitor for suspicious traffic patterns and implement network segmentation to limit the potential impact of successful exploitation attempts. The long-term solution involves updating the sauce-connect implementation to enforce secure communication protocols and ensuring that all binary resources are downloaded through encrypted channels that provide both confidentiality and integrity guarantees. Regular security assessments of third-party dependencies and automated vulnerability scanning should be implemented to prevent similar issues from emerging in other components of the testing infrastructure.