CVE-2023-34966

Publication date 19 July 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	24.04 LTS noble	Fixed 2:4.18.5+dfsg-1ubuntu1
	23.10 mantic	Fixed 2:4.18.5+dfsg-1ubuntu1
	23.04 lunar	Fixed 2:4.17.7+dfsg-1ubuntu1.1
	22.10 kinetic	Fixed 2:4.16.8+dfsg-0ubuntu1.2
	22.04 LTS jammy	Fixed 2:4.15.13+dfsg-0ubuntu1.2
	20.04 LTS focal	Fixed 2:4.15.13+dfsg-0ubuntu0.20.04.3
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)