JLine: Unauthenticated Remote DoS via Unbounded Telnet NAWS Terminal Geometry
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
nono source reports it
JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
jline · jline3References
https://github.com/jline/jline3/commit/3ea9cad8699714dc072fade29d36be0d1e23d708https://github.com/jline/jline3/commit/733eb353dca7b0ea0252e724445b6defa29c393ehttps://github.com/jline/jline3/commit/86b7ba7801988aadb1a67555629522a71d603bd3https://github.com/jline/jline3/pull/2000https://github.com/jline/jline3/releases/tag/4.0.16https://github.com/jline/jline3/releases/tag/4.2.1https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933