Encryption Bypass Vulnerability in SimpleSAMLphp: CVE-2017-12871
Summary
CVE-2017-12871: The aesEncrypt method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.x through 1.14.11 makes it easier for context-dependent attackers to bypass the encryption protection mechanism by leveraging use of the firs... Affects simplesamlphp across 2 version ranges.
< 1.14.15-1
< 77df6a932d46daa35e364925eb73a175010dc904
Fixed in 1.14.15-1. How to fix ↓
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Background
SimpleSAMLphp is an open-source application written in PHP that facilitates the implementation of SAML (Security Assertion Markup Language) for web-based single sign-on (SSO). It allows users to authenticate across different domains while maintaining a secure session. The package is widely used in various web applications to manage user identities and access control. However, a significant vulnerability has been identified that compromises its encryption mechanism, potentially exposing sensitive data.
Vulnerability Detail
The aesEncrypt method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp versions 1.14.x through 1.14.11 is vulnerable to an encryption bypass. This vulnerability arises from the use of the first 16 bytes of the secret key as the initialization vector (IV), which can be exploited by context-dependent attackers. This flaw allows attackers to bypass the encryption protection mechanism, leading to unauthorized access to sensitive information. The ramifications of this vulnerability can be severe, as it undermines the confidentiality of encrypted data.
How To Fix
Minimum fixed version
1.14.15-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade simplesamlphpTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can implement additional security measures such as using a different encryption method or enhancing the complexity of the secret key. However, upgrading to the fixed version is strongly recommended for long-term security.
Conclusion
CVE-2017-12871 represents a significant security risk for users of SimpleSAMLphp versions 1.14.x through 1.14.11. It is crucial for users to upgrade to version 1.14.15-1 or later to mitigate the risk of encryption bypass and protect sensitive data. Regular monitoring and security practices are essential to maintain the integrity of applications using this package.
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FAQ
CVE-2017-12871 is a vulnerability in SimpleSAMLphp that allows attackers to bypass encryption protections due to improper use of the initialization vector.
The vulnerability affects SimpleSAMLphp versions 1.14.x through 1.14.11.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score of CVE-2017-12871 is 5.9, indicating a moderate level of severity.
If you cannot upgrade immediately, consider implementing additional security measures and monitor your application closely for any suspicious activity.
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