A vulnerability, which was classified as problematic, has been found in Jenkins up to 2.218/LTS 2.204.1 (Continuous Integration Software). Affected by this issue is an unknown functionality of the component Comparison. The manipulation with an unknown input leads to a timing discrepancy vulnerability. Using CWE to declare the problem leads to CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. Impacted is confidentiality. CVE summarizes:

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier did not use a constant-time comparison function for validating connection secrets, which could potentially allow an attacker to use a timing attack to obtain this secret.

The weakness was presented 01/29/2020 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2020-2101 since 12/05/2019. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Productinfo

Type

• Continuous Integration Software

Name

• Jenkins

Version

• 2.218
• LTS 2.204.0
• LTS 2.204.1

License

• open-source

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