CVE-2017-2585: org.keycloak:keycloak-core - Timing Attack Vulnerability
Summary
CVE-2017-2585: keycloak-core vulnerable to timing attacks against JWS token verification. Affects org.keycloak:keycloak-core versions < 2.5.1. Fixed in 2.5.1. How to fix ↓
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Background
org.keycloak:keycloak-core is a Maven package that provides core functionality for Red Hat Keycloak, an open-source identity and access management solution. It is responsible for handling HMAC verification for JWS tokens. HMAC (Hash-based Message Authentication Code) is a cryptographic algorithm used for verifying the integrity and authenticity of a message. However, the implementation in versions prior to 2.5.1 is susceptible to a timing attack, which can potentially compromise the security of the application.
Vulnerability Detail
The vulnerability arises from the non-constant time execution of the HMAC verification method for JWS tokens in Red Hat Keycloak. A timing attack is a type of side-channel attack where an attacker can exploit variations in the execution time of a cryptographic algorithm to deduce sensitive information. In this case, an attacker could potentially determine the HMAC key used for token verification by measuring the time it takes for the verification process to complete. This could lead to unauthorized access or other security breaches.
How To Fix
Latest published version: 26.8.1 as of 22 Oct 2026
Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
2.5.1
This is the first release that contains the fix.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended solution is to upgrade to the fixed version of the package.
Conclusion
The timing attack vulnerability in org.keycloak:keycloak-core can be mitigated by upgrading to version 2.5.1 or later. It is important to promptly apply the fix to ensure the security of the application. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
org.keycloak:keycloak-core is a Maven package that provides core functionality for Red Hat Keycloak, an open-source identity and access management solution.
A timing attack is a type of side-channel attack where an attacker can exploit variations in the execution time of a cryptographic algorithm to deduce sensitive information.
HMAC verification is a process of verifying the integrity and authenticity of a message using a cryptographic algorithm called Hash-based Message Authentication Code (HMAC).
The timing attack vulnerability in org.keycloak:keycloak-core could potentially allow an attacker to determine the HMAC key used for token verification, leading to unauthorized access or other security breaches.
To fix this vulnerability, it is recommended to upgrade to version 2.5.1 or later of org.keycloak:keycloak-core.
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