CVE-2017-12973 : Security Advisory and Response
Learn about CVE-2017-12973, a vulnerability in Nimbus JOSE+JWT library version prior to 4.39 that allows attackers to conduct a padding oracle attack due to improper HMAC handling.
Nimbus JOSE+JWT library version prior to 4.39 is vulnerable to potential attacks due to improper handling of an invalid HMAC during authenticated AES-CBC decryption.
Understanding CVE-2017-12973
The vulnerability in Nimbus JOSE+JWT library version prior to 4.39 can be exploited by attackers to carry out a padding oracle attack.
What is CVE-2017-12973?
The CVE-2017-12973 vulnerability arises from the library's failure to handle an invalid HMAC during authenticated AES-CBC decryption, creating a security risk for potential attacks.
The Impact of CVE-2017-12973
The vulnerability allows attackers to exploit the library's improper handling of an invalid HMAC to conduct a padding oracle attack, compromising the confidentiality and integrity of encrypted data.
Technical Details of CVE-2017-12973
The technical details of the CVE-2017-12973 vulnerability are as follows:
Vulnerability Description
The Nimbus JOSE+JWT library version prior to 4.39 improperly proceeds after detecting an invalid HMAC during authenticated AES-CBC decryption, enabling attackers to perform a padding oracle attack.
Affected Systems and Versions
- Product: Nimbus JOSE+JWT
- Vendor: N/A
- Versions affected: All versions prior to 4.39
Exploitation Mechanism
Attackers can exploit the vulnerability by manipulating the library's improper handling of an invalid HMAC during authenticated AES-CBC decryption to launch a padding oracle attack.
Mitigation and Prevention
To mitigate the CVE-2017-12973 vulnerability, follow these steps:
Immediate Steps to Take
- Update the Nimbus JOSE+JWT library to version 4.39 or newer.
- Monitor for any unusual activities that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update software libraries and dependencies to the latest secure versions.
- Implement strong encryption practices and protocols to enhance data security.
Patching and Updates
- Apply patches and updates provided by the library vendor to address the vulnerability and enhance security measures.