CVE-2007-5541 in Web Browser
Summary
by MITRE
Unspecified vulnerability in Opera before 9.24, when using an "external" newsgroup or e-mail client, allows remote attackers to execute arbitrary commands via unknown vectors.
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Analysis
by VulDB Data Team • 03/16/2021
This vulnerability exists in Opera web browser versions prior to 9.24 and specifically affects the handling of external newsgroup and email client integrations. The flaw represents a critical command execution vulnerability that can be exploited by remote attackers through unspecified attack vectors when users interact with external email or newsgroup clients. The vulnerability stems from insufficient input validation and sanitization mechanisms within Opera's external client integration functionality, creating a potential pathway for arbitrary code execution on affected systems. This issue falls under the category of command injection vulnerabilities where attacker-controlled data can be interpreted as executable commands rather than benign input.
The technical implementation of this vulnerability likely involves Opera's handling of URL schemes or protocol handlers when initiating external applications for email or newsgroup access. When users click on email links or newsgroup references, Opera may invoke external applications with parameters that are not properly escaped or validated. This creates a scenario where maliciously crafted URLs or content can be used to inject commands that will execute within the context of the external client application. The vulnerability is particularly dangerous because it leverages the trust relationship between the browser and external applications, allowing attackers to bypass normal security boundaries. According to CWE classification, this represents a command injection vulnerability (CWE-77) that can lead to arbitrary code execution and potentially full system compromise. The ATT&CK framework would categorize this under T1059.007 for command and script injection techniques.
The operational impact of this vulnerability is significant as it allows remote attackers to execute arbitrary commands on affected systems without requiring user interaction beyond visiting a malicious website or clicking on a compromised link. Attackers can leverage this vulnerability to install malware, modify system files, steal sensitive information, or establish persistent access to compromised systems. The vulnerability affects all users of Opera versions prior to 9.24, making it a widespread concern for organizations relying on this browser. The attack surface is expanded by the fact that external client integrations are commonly used features that users frequently interact with, increasing the likelihood of exploitation. Organizations may experience unauthorized access to email accounts, data breaches, and potential lateral movement within networks if attackers establish a foothold through this vulnerability.
Mitigation strategies should focus on immediate browser updates to version 9.24 or later where the vulnerability has been patched. System administrators should implement network monitoring to detect suspicious URL patterns and external client invocations that may indicate exploitation attempts. Additional protective measures include restricting external client integrations through browser configuration policies, implementing application whitelisting to control which external applications can be invoked, and conducting regular security assessments of browser configurations. Organizations should also consider deploying web application firewalls and intrusion detection systems to monitor for exploitation attempts. The vulnerability highlights the importance of proper input validation and the principle of least privilege in external application integration. Users should be educated about the risks of clicking on untrusted links and the importance of keeping their browser software up to date. Regular patch management processes should be implemented to ensure timely deployment of security updates and prevent exploitation of known vulnerabilities.