CVE-2022-25292 in Firebox
Summary
by MITRE • 02/24/2022
A wgagent stack-based buffer overflow in WatchGuard Firebox and XTM appliances allows an authenticated remote attacker to potentially execute arbitrary code by initiating a firmware update with a malicious upgrade image. This vulnerability impacts Fireware OS before 12.7.2_U2, 12.x before 12.1.3_U8, and 12.2.x through 12.5.x before 12.5.9_U2.
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Analysis
by VulDB Data Team • 02/26/2022
The vulnerability identified as CVE-2022-25292 represents a critical stack-based buffer overflow flaw within the wgagent component of WatchGuard Firebox and XTM appliances. This issue specifically manifests during firmware update operations when a malicious upgrade image is initiated, creating a potential exploitation vector for authenticated remote attackers. The vulnerability affects multiple versions of Fireware OS including releases before 12.7.2_U2, 12.1.3_U8, and various 12.2.x through 12.5.x versions prior to their respective security patches. The flaw resides in how the system processes firmware update images, particularly when handling user-supplied data during the upgrade process. This buffer overflow condition occurs when the system fails to properly validate or limit the size of data being copied to a fixed-size stack buffer, allowing an attacker to overwrite adjacent memory locations and potentially manipulate program execution flow.
The technical implementation of this vulnerability stems from inadequate input validation within the wgagent service responsible for firmware management operations. When an authenticated user uploads a malicious firmware image, the system processes the image data without sufficient bounds checking, leading to a classic stack buffer overflow scenario. The attacker can craft a specially formatted upgrade image that, when processed, causes the buffer to overflow and overwrite return addresses or other critical stack variables. This memory corruption can potentially be leveraged to execute arbitrary code with the privileges of the wgagent process, which typically runs with elevated system permissions. The vulnerability's impact is amplified by the fact that it requires only authentication, meaning that an attacker who has gained access to legitimate administrative credentials can exploit this weakness remotely without requiring physical access to the appliance.
The operational implications of CVE-2022-25292 extend beyond simple code execution, as it represents a significant compromise of network security infrastructure. Attackers who successfully exploit this vulnerability can potentially gain full control over the affected appliance, enabling them to modify firewall rules, intercept network traffic, establish persistence mechanisms, or use the device as a pivot point for attacking other systems within the network. The vulnerability's presence in multiple Fireware OS versions creates widespread exposure across organizations using WatchGuard appliances, particularly in environments where firmware updates are regularly performed. Network defenders must consider that this vulnerability could be exploited to undermine the fundamental security posture of organizations relying on these appliances for network protection. The attack vector is particularly concerning because it leverages legitimate administrative functionality, making detection more challenging as malicious firmware updates would appear to be normal administrative operations.
Organizations affected by this vulnerability should prioritize immediate remediation through official firmware updates provided by WatchGuard, specifically targeting the versions mentioned in the advisory. The mitigation strategy should include implementing network segmentation to limit the impact of potential exploitation and monitoring for unusual firmware update activities. Security teams should also consider deploying network-based intrusion detection systems to identify potential exploitation attempts, as the vulnerability may generate specific network traffic patterns during exploitation. Additionally, organizations should review and enforce strict access controls for administrative accounts, implement multi-factor authentication, and ensure that only trusted personnel can initiate firmware updates. The vulnerability aligns with CWE-121 stack-based buffer overflow classification and represents a potential ATT&CK technique for privilege escalation and persistence within network environments. Regular vulnerability assessments and network monitoring should be enhanced to detect similar weaknesses in other network security appliances, as this vulnerability demonstrates the importance of input validation in critical system components.