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CVE-2023-34966

Published: 19 July 2023

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
trusty Needs triage

xenial Needs triage

bionic Needs triage

upstream Needs triage

focal
Released (2:4.15.13+dfsg-0ubuntu0.20.04.3)
jammy
Released (2:4.15.13+dfsg-0ubuntu1.2)
kinetic
Released (2:4.16.8+dfsg-0ubuntu1.2)
lunar
Released (2:4.17.7+dfsg-1ubuntu1.1)
mantic
Released (2:4.18.5+dfsg-1ubuntu1)

Severity score breakdown

Parameter Value
Base score 7.5
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