CVE-2022-2778 in Deploy
Summary
by MITRE • 09/30/2022
In affected versions of Octopus Deploy it is possible to bypass rate limiting on login using null bytes.
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Analysis
by VulDB Data Team • 05/27/2026
The vulnerability identified as CVE-2022-2778 represents a significant security flaw in Octopus Deploy software versions that allows unauthorized users to circumvent established rate limiting mechanisms during authentication attempts. This issue specifically exploits the handling of null bytes within authentication requests, enabling attackers to repeatedly attempt login operations without triggering the intended protective measures. The flaw resides in how the system processes user credentials when null byte characters are present in the authentication input, creating a bypass condition that undermines the security controls designed to prevent brute force attacks and credential stuffing attempts. This vulnerability directly impacts the integrity of the authentication system and compromises the effectiveness of access control measures that rely on rate limiting to protect against automated attack vectors.
The technical implementation of this vulnerability stems from improper input validation and sanitization within the authentication processing pipeline of Octopus Deploy. When null bytes are included in login requests, the system fails to properly normalize or reject such input sequences, allowing the authentication service to process these malformed requests as if they contained valid credentials. This behavior creates a condition where each null byte injection effectively resets or bypasses the rate limiting counter, enabling attackers to perform unlimited login attempts without triggering the protective mechanisms. The flaw demonstrates poor adherence to secure coding practices and highlights insufficient sanitization of user input before authentication processing, which aligns with common weaknesses described in CWE-20 Input Validation and CWE-116 Improper Encoding or Escaping of Output. The vulnerability essentially transforms the intended rate limiting mechanism from a protective barrier into a potential attack vector.
The operational impact of CVE-2022-2778 extends beyond simple authentication bypass, creating substantial risk for organizations relying on Octopus Deploy for deployment automation and infrastructure management. Attackers can exploit this vulnerability to conduct prolonged brute force attacks against user accounts, potentially leading to unauthorized system access and privilege escalation. The bypass of rate limiting also enables credential stuffing attacks where attackers can test multiple credential combinations without restriction, increasing the likelihood of successful account compromise. Organizations may experience increased system load due to the excessive authentication attempts, potentially impacting performance and availability of legitimate users. This vulnerability particularly affects environments where Octopus Deploy manages critical infrastructure deployments, as successful exploitation could lead to unauthorized code deployment, configuration changes, or complete system compromise. The impact is further exacerbated by the fact that rate limiting is a fundamental security control that organizations rely upon to prevent automated attacks, making this bypass particularly dangerous in production environments.
Mitigation strategies for CVE-2022-2778 should focus on immediate patch application from Octopus Deploy, as the vulnerability requires core system updates to address the underlying input validation flaws. Organizations should implement additional network-level protections such as firewall rules and intrusion detection systems to monitor for unusual authentication patterns that might indicate exploitation attempts. Network segmentation and additional authentication layers including multi-factor authentication should be deployed to reduce the impact of potential credential compromise. Security teams should conduct thorough audit reviews of authentication logs to identify any suspicious activity that might indicate exploitation attempts, paying particular attention to repeated login attempts with malformed input sequences. The implementation of proper input sanitization and normalization processes within the authentication system is essential, along with regular security testing and code reviews to prevent similar vulnerabilities from emerging. Organizations should also consider implementing account lockout mechanisms and enhanced monitoring for authentication failures to detect and respond to exploitation attempts more effectively, aligning with security best practices outlined in the MITRE ATT&CK framework under the credential access and defense evasion domains.