JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session.
This issue is fixed in versions 3.30.15 and 4.3.1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 7
https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541
security-advisories@github.com
https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae
security-advisories@github.com
https://github.com/jline/jline3/pull/2012
security-advisories@github.com
https://github.com/jline/jline3/pull/2018
security-advisories@github.com
https://github.com/jline/jline3/releases/tag/4.3.1
security-advisories@github.com
https://github.com/jline/jline3/releases/tag/jline-3.30.15
security-advisories@github.com
https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw
security-advisories@github.com