CVE-2024-12729 in Sophos
Summary
by MITRE • 12/19/2024
A post-auth code injection vulnerability in the User Portal allows authenticated users to execute code remotely in Sophos Firewall older than version 21.0 MR1 (21.0.1).
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Analysis
by VulDB Data Team • 11/12/2025
This vulnerability exists within the Sophos Firewall User Portal component where authenticated users can exploit a post-authentication code injection flaw to execute arbitrary code remotely. The issue affects versions prior to 21.0 MR1, specifically impacting the 21.0.1 release and earlier iterations. The vulnerability represents a critical security weakness that undermines the integrity and confidentiality of the affected systems, as it allows privilege escalation from authenticated user status to full system command execution capabilities. The flaw stems from insufficient input validation and sanitization within the User Portal's code processing mechanisms, creating an avenue for malicious code injection attacks that bypass normal authentication and authorization controls.
The technical implementation of this vulnerability involves the exploitation of improper handling of user-supplied input within the firewall's web interface components. When authenticated users submit crafted payloads through the User Portal, the system fails to adequately validate or sanitize the input before processing, allowing malicious code to be executed within the context of the firewall's operating system. This code injection occurs at the application level where user inputs are directly incorporated into system commands or interpreted as executable code without proper security controls. The vulnerability aligns with common weakness enumerations such as CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and CWE-79, addressing "Cross-site Scripting (XSS)" vulnerabilities that share similar input validation weaknesses. The attack vector requires a pre-existing authenticated session, making it less accessible than fully unauthenticated attacks but still highly dangerous due to the elevated privileges available to authenticated users.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and potential lateral movement within network environments. An attacker who successfully exploits this vulnerability gains the ability to execute arbitrary commands on the firewall itself, potentially leading to unauthorized access to network traffic, modification of security policies, or even complete network infiltration through the compromised firewall as a pivot point. The implications are particularly severe in enterprise environments where Sophos Firewalls serve as critical network security appliances, as the compromise of such devices can result in widespread network exposure and data breaches. The vulnerability also affects the firewall's ability to maintain network integrity and security posture, as malicious actors can modify firewall rules, disable security features, or establish persistent backdoors within the network infrastructure. Organizations may experience service disruptions, compliance violations, and potential regulatory penalties due to the security breach.
Mitigation strategies should focus on immediate remediation through version updates to Sophos Firewall 21.0 MR1 or later releases, which contain patches addressing the code injection vulnerability. Network administrators must prioritize deployment of these security updates across all affected systems while implementing additional monitoring controls to detect potential exploitation attempts. Organizations should also consider implementing network segmentation and access controls to limit the impact of potential compromise, ensuring that authenticated users have minimal privileges and that administrative functions are properly isolated. Security teams should establish enhanced logging and monitoring procedures specifically targeting suspicious command execution patterns and unusual user behavior within the User Portal interface. The implementation of web application firewalls and input validation controls can provide additional defense-in-depth measures, while regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of the network security infrastructure. This vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing comprehensive security monitoring strategies to protect against sophisticated attack vectors targeting network infrastructure components.