CVE-2007-4700 in Mac OS X
Summary
by MITRE
Unspecified vulnerability in WebKit on Apple Mac OS X 10.4 through 10.4.10 allows remote attackers to use Safari as an indirect proxy and send attacker-controlled data to arbitrary TCP ports via unknown vectors.
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Analysis
by VulDB Data Team • 07/31/2019
This vulnerability resides within the WebKit rendering engine used by Safari on Apple Mac OS X versions 10.4 through 10.4.10, representing a significant security flaw that enables remote attackers to leverage the browser as an indirect proxy mechanism. The unspecified nature of the vulnerability vectors suggests a fundamental weakness in how WebKit handles network communications or proxy configurations, potentially allowing malicious actors to bypass normal network restrictions and establish connections to arbitrary TCP ports. This type of vulnerability falls under the category of proxy abuse or network manipulation flaws that can be exploited to extend the attack surface beyond the intended browser boundaries.
The technical implementation of this vulnerability appears to involve the exploitation of WebKit's underlying network stack or proxy handling mechanisms, where attackers can manipulate the browser's network behavior to function as a conduit for sending data to targets that would normally be restricted or inaccessible. This indirect proxy functionality represents a serious deviation from expected browser behavior, as browsers should not be capable of acting as network proxies for arbitrary destinations without explicit user consent or proper authorization mechanisms. The vulnerability likely stems from insufficient input validation or improper handling of network connection requests within the WebKit engine's implementation.
Operationally, this vulnerability presents a substantial risk to users of affected Mac OS X versions, as it allows attackers to potentially exfiltrate data, establish unauthorized connections to internal systems, or use the compromised browser as part of a larger attack chain. The ability to send attacker-controlled data to arbitrary TCP ports means that malicious actors could potentially probe internal networks, establish command and control channels, or deliver payloads to systems that are normally protected by network segmentation. This capability directly aligns with attack patterns described in the attack tree framework where browsers serve as initial access points for lateral movement and network reconnaissance activities. The vulnerability could be exploited through various means including malicious websites, compromised web content, or social engineering tactics that trick users into visiting harmful pages.
Mitigation strategies for this vulnerability should focus on immediate patching of affected systems, as Apple would have released security updates addressing the underlying WebKit flaw. Network administrators should implement additional monitoring and filtering measures to detect unusual outbound connections from Safari processes, particularly those attempting to connect to non-standard ports or destinations. The implementation of web application firewalls and network access control lists can help prevent unauthorized proxy usage patterns. Organizations should also consider implementing browser hardening measures such as disabling unnecessary network features, restricting browser permissions, and employing security frameworks like the NIST Cybersecurity Framework to establish comprehensive protection strategies. This vulnerability demonstrates the critical importance of maintaining up-to-date browser software and implementing layered security controls to prevent exploitation of rendering engine flaws that can be leveraged for network-level attacks.