Platform
nodejs
Component
passport-azure-ad
Fixed in
1.4.6
CVE-2016-7191 is an authentication bypass vulnerability affecting the passport-azure-ad Node.js module. This flaw allows remote attackers to bypass authentication by crafting malicious tokens, effectively gaining unauthorized access. The vulnerability impacts versions prior to 1.4.6 and 2.0.1 and can be resolved by upgrading to a patched version.
Successful exploitation of CVE-2016-7191 allows an attacker to bypass the authentication mechanism of applications relying on passport-azure-ad for Azure Active Directory integration. This could lead to unauthorized access to sensitive data, modification of application settings, or even complete control of the application server. The impact is particularly severe in environments where passport-azure-ad is used to secure critical resources or APIs, as attackers could potentially impersonate legitimate users or gain administrative privileges. The blast radius extends to any data or functionality accessible through the authenticated application.
CVE-2016-7191 has been publicly disclosed and a proof-of-concept (POC) may be available. While there are no reports of widespread active exploitation at the time of writing, the ease of exploitation and the potential impact make it a significant risk. The vulnerability was published on 2018-07-26. Severity is considered HIGH due to the potential for complete authentication bypass.
Exploit Status
EPSS
3.80% (88% percentile)
CVSS Vector
The primary mitigation for CVE-2016-7191 is to upgrade the passport-azure-ad module to version 1.4.6 or later for version 1.x, or to version 2.0.1 or later for version 2.x. If an immediate upgrade is not feasible, consider implementing stricter token validation on the application side, although this is not a complete substitute for patching. Review and restrict the allowed issuer URLs to prevent the acceptance of tokens from unauthorized sources. Monitor application logs for suspicious authentication attempts or token validation failures. After upgrade, confirm by attempting authentication with a known valid token and verifying that the validation process functions as expected.
No official patch available. Check for workarounds or monitor for updates.
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CVE-2016-7191 is a vulnerability in the passport-azure-ad Node.js module that allows attackers to bypass authentication by crafting malicious tokens, potentially gaining unauthorized access to applications.
You are affected if you are using a version of passport-azure-ad prior to 1.4.6 (for version 1.x) or 2.0.1 (for version 2.x). Check your installed version using npm list passport-azure-ad.
Upgrade to version 1.4.6 or later for version 1.x, or to version 2.0.1 or later for version 2.x. Consider stricter token validation as an interim measure.
While there are no widespread reports of active exploitation, the vulnerability's ease of exploitation and potential impact make it a significant risk. Monitor your systems for suspicious activity.
Refer to the passport-azure-ad project's repository and related security advisories for more information: https://github.com/AzureAD/passport-azure-ad
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