CVE-2019-19084 in Octopus Deploy
Summary
by MITRE
In Octopus Deploy 3.3.0 through 2019.10.4, an authenticated user with PackagePush permission to upload packages could upload a maliciously crafted package, triggering an exception that exposes underlying operating system details.
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Analysis
by VulDB Data Team • 02/23/2024
The vulnerability identified as CVE-2019-19084 affects Octopus Deploy versions ranging from 3.3.0 through 2019.10.4, representing a critical information disclosure flaw that exploits the package upload functionality within the deployment platform. This issue specifically targets authenticated users who possess PackagePush permissions, which allows them to upload packages to the Octopus Deploy server. The vulnerability manifests when a maliciously crafted package is uploaded, triggering an exception that inadvertently reveals underlying operating system details to the attacker. This represents a significant security risk as it provides adversaries with valuable reconnaissance information about the target environment's operating system, version, and potentially other system characteristics that could be leveraged for further exploitation. The flaw exists within the package handling and validation process where insufficient error handling and sanitization allows system-level information to leak through exception messages. This vulnerability directly maps to CWE-209, which describes "Information Exposure Through an Exception," and aligns with ATT&CK technique T1082, Information Discovery, as it enables adversaries to gather system information. The impact extends beyond simple information disclosure as the leaked operating system details could be used to identify specific vulnerabilities or misconfigurations in the underlying system, potentially enabling more sophisticated attacks. The authenticated nature of this vulnerability means that an attacker must first obtain valid credentials with PackagePush permissions, but once achieved, the exposure of system-level information provides substantial intelligence for targeting subsequent attacks. Organizations using affected versions of Octopus Deploy face increased risk of targeted attacks that could exploit the disclosed operating system information to craft more effective exploits or identify additional system weaknesses. The vulnerability demonstrates a lack of proper input validation and error handling in the package upload process, where the system fails to sanitize exception messages before returning them to users. This flaw represents a common security oversight where developers assume that internal system information should remain hidden from end users, but inadequate error handling mechanisms expose this information through exception stack traces or error messages. The exploitation of this vulnerability requires minimal technical skill and can be achieved through standard package upload procedures, making it particularly dangerous as it can be triggered by any user with appropriate permissions.
The operational impact of CVE-2019-19084 extends beyond immediate information disclosure to create a foundation for more sophisticated attack vectors. When an attacker successfully uploads a malicious package and triggers the exception, they gain insights into the target system's architecture, operating system version, and potentially installed software components. This information can be invaluable for crafting targeted attacks against specific system vulnerabilities or for performing advanced reconnaissance activities. The vulnerability's presence in multiple versions of Octopus Deploy indicates a prolonged period during which organizations were exposed to this risk without proper mitigation. Security teams must consider this vulnerability as part of their broader threat landscape, as the leaked information could enable attackers to bypass security controls or identify weaknesses in the overall system infrastructure. The exposure of operating system details also increases the risk of successful exploitation through known vulnerabilities specific to the disclosed system versions, particularly if the system is running outdated software components. This vulnerability underscores the importance of proper error handling and information sanitization in web applications, as the system's failure to properly handle package upload exceptions creates an information leak that could be exploited by threat actors. The affected versions represent a significant timeframe where organizations could have been exposed to this vulnerability without awareness, highlighting the need for regular security assessments and patch management processes. Organizations should evaluate their current deployment configurations and ensure that proper access controls are in place to limit PackagePush permissions to only trusted users, while also implementing monitoring for suspicious package upload activities that could indicate exploitation attempts.
Mitigation strategies for CVE-2019-19084 should focus on both immediate remediation and long-term security improvements. The most effective immediate solution involves upgrading to a patched version of Octopus Deploy that resolves this vulnerability, as newer versions implement proper error handling and sanitization mechanisms to prevent information disclosure through exception messages. Organizations should also implement network segmentation and access controls to limit the scope of users who possess PackagePush permissions, ensuring that only trusted personnel can upload packages to the system. Additionally, security monitoring should be enhanced to detect unusual package upload patterns or attempts that might indicate exploitation of this vulnerability. The implementation of proper input validation and error handling procedures should be enforced across all package handling processes, ensuring that exception messages do not contain system-level information that could be leveraged by attackers. Organizations should also consider implementing automated security scanning tools that can detect and prevent the upload of potentially malicious packages before they can trigger the vulnerability. The vulnerability's classification as CWE-209 emphasizes the need for comprehensive error handling practices throughout the application lifecycle, including proper exception management, logging, and sanitization of error messages. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the deployment infrastructure, as this flaw demonstrates a pattern of inadequate security controls in system error handling. The ATT&CK framework's categorization of this vulnerability under information discovery techniques indicates that organizations should also implement detection capabilities for suspicious information gathering activities and establish incident response procedures for handling potential exploitation attempts. Organizations should also review their patch management processes to ensure that security updates are applied promptly and that all systems are regularly assessed for vulnerabilities that could be exploited through similar attack vectors. The vulnerability serves as a reminder that even authenticated users with legitimate permissions can pose security risks if proper safeguards are not implemented, emphasizing the importance of defense in depth and principle of least privilege in security architecture design.