CVE-2019-11873

Published: 23 May 2019

wolfSSL 4.0.0 has a Buffer Overflow in DoPreSharedKeys in tls13.c when a current identity size is greater than a client identity size. An attacker sends a crafted hello client packet over the network to a TLSv1.3 wolfSSL server. The length fields of the packet: record length, client hello length, total extensions length, PSK extension length, total identity length, and identity length contain their maximum value which is 2^16. The identity data field of the PSK extension of the packet contains the attack data, to be stored in the undefined memory (RAM) of the server. The size of the data is about 65 kB. Possibly the attacker can perform a remote code execution attack.

Priority

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package	Release	Status
wolfssl Launchpad, Ubuntu, Debian	bionic	Needs triage
	cosmic	Ignored (end of life)
	disco	Ignored (end of life)
	eoan	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	focal	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	groovy	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	hirsute	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	impish	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	jammy	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	kinetic	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	lunar	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	mantic	Not vulnerable (4.1.0+dfsg-1ubuntu1)
	trusty	Does not exist
	upstream	Needs triage
	xenial	Needs triage

Severity score breakdown

Parameter	Value
Base score	9.8
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=929468

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