CVE-2025-24364 in vaultwarden
Summary
by MITRE • 01/27/2025
vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Attacker with authenticated access to the vaultwarden admin panel can execute arbitrary code in the system. The attacker could then change some settings to use sendmail as mail agent but adjust the settings in such a way that it would use a shell command. It then also needed to craft a special favicon image which would have the commands embedded to run during for example sending a test email. This vulnerability is fixed in 1.33.0.
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Analysis
by VulDB Data Team • 08/20/2025
The vulnerability CVE-2025-24364 represents a critical arbitrary code execution flaw in vaultwarden, an unofficial Bitwarden compatible server implementation written in Rust that was previously known as bitwarden_rs. This vulnerability specifically targets the administrative interface of the system, where authenticated attackers can leverage their access privileges to escalate their compromise to full system control. The flaw exists within the email configuration handling mechanisms of the application, demonstrating a dangerous combination of insufficient input validation and improper command execution sanitization. The vulnerability is particularly concerning because it allows an attacker with administrative credentials to bypass normal security boundaries and execute arbitrary system commands with the privileges of the vaultwarden service account.
The technical exploitation of this vulnerability involves multiple attack vectors that demonstrate sophisticated chaining of security flaws. The attacker must first gain authenticated access to the vaultwarden admin panel, which is a prerequisite for exploitation. Once authenticated, the attacker can manipulate the mail agent configuration settings to utilize sendmail as the underlying mail delivery mechanism. However, the vulnerability extends beyond simple configuration changes, as the attacker can manipulate the sendmail command execution by carefully crafting specific parameters that will trigger shell command execution. This technique leverages the principle of command injection, where user-controlled input is improperly integrated into system commands, creating a pathway for arbitrary code execution. The attack requires the attacker to create a specially crafted favicon image that contains embedded shell commands, which will be executed during the test email sending process, demonstrating how seemingly innocuous features can become attack vectors.
The operational impact of this vulnerability is severe and far-reaching for organizations using vaultwarden as their password management solution. A successful exploitation allows attackers to completely compromise the system, potentially leading to data exfiltration, persistence mechanisms installation, and further lateral movement within the network. The vulnerability affects the confidentiality, integrity, and availability of the password management infrastructure, which is critical for enterprise security operations. Organizations that rely on vaultwarden for storing sensitive credentials and authentication information face significant risk, as the compromise of a single administrative account can lead to complete system takeover. The vulnerability also impacts the trust model of the application, as it demonstrates that administrative privileges can be used as a stepping stone to full system compromise, undermining the security assumptions of the application's architecture.
The mitigation strategy for CVE-2025-24364 requires immediate action to upgrade to version 1.33.0 or later, which contains the necessary patches to address the arbitrary code execution vulnerability. Organizations should also implement strict access controls for the administrative interface, including multi-factor authentication, IP whitelisting, and regular monitoring of administrative activities. The fix addresses the command injection vulnerability by properly sanitizing user inputs and implementing stricter validation of mail agent configurations. Security teams should conduct comprehensive audits of their vaultwarden deployments to ensure all instances are updated and monitor for any suspicious administrative activities. This vulnerability aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and reflects tactics described in the MITRE ATT&CK framework under T1059 for command and scripting interpreter. Organizations should also consider implementing network segmentation and monitoring solutions to detect unusual outbound connections that might indicate successful exploitation of this vulnerability. The patch addresses the root cause by implementing proper input validation and command execution sanitization, preventing the injection of malicious commands through the mail configuration interface.