The maintainers of the open-resource steady integration/constant delivery and deployment (CI/CD) automation program Jenkins have solved 9 security flaws, which include a critical bug that, if productively exploited, could consequence in remote code execution (RCE).
The issue, assigned the CVE identifier CVE-2024-23897, has been explained as an arbitrary file go through vulnerability as a result of the created-in command line interface (CLI)
“Jenkins uses the args4j library to parse command arguments and choices on the Jenkins controller when processing CLI instructions,” the maintainers explained in a Wednesday advisory.
“This command parser has a attribute that replaces an @ character followed by a file path in an argument with the file’s contents (expandAtFiles). This element is enabled by default and Jenkins 2.441 and previously, LTS 2.426.2 and before does not disable it.”
A risk actor could exploit this quirk to study arbitrary documents on the Jenkins controller file program working with the default character encoding of the Jenkins controller method.
Although attackers with “Total/Browse” authorization can read through entire information, these without having it can read the very first three lines of the documents depending on the CLI commands.
On top of that, the shortcoming could be weaponized to study binary data files containing cryptographic keys, albeit with specified constraints. Offered the binary insider secrets can be extracted, Jenkins suggests it could open up the door to a variety of attacks –
- Remote code execution via Resource Root URLs
- Distant code execution through “Bear in mind me” cookie
- Remote code execution by means of stored cross-website scripting (XSS) attacks through construct logs
- Remote code execution by means of CSRF defense bypass
- Decrypt secrets and techniques stored in Jenkins
- Delete any item in Jenkins
- Down load a Java heap dump
“When information containing binary knowledge can be browse, the influenced aspect tries to read them as strings employing the controller process’s default character encoding,” Jenkins stated.
“This is most likely to final result in some bytes not getting examine effectively and getting replaced with a placeholder worth. Which bytes can or are unable to be browse depends on this character encoding.”
Security researcher Yaniv Nizry has been credited with getting and reporting the flaw, which has been preset in Jenkins 2.442, LTS 2.426.3 by disabling the command parser aspect.
As a small-expression workaround right up until the patch can be applied, it really is advisable to flip off accessibility to the CLI.
The enhancement comes virtually a year after Jenkins dealt with a pair of serious security vulnerabilities dubbed CorePlague (CVE-2023-27898 and CVE-2023-27905) that could direct to code execution on qualified programs.
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Some parts of this article are sourced from:
thehackernews.com
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