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CVE-2023-34967

Published: 19 July 2023

A Type Confusion vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets, one encoded data structure is a key-value style dictionary where the keys are character strings, and the values can be any of the supported types in the mdssvc protocol. Due to a lack of type checking in callers of the dalloc_value_for_key() function, which returns the object associated with a key, a caller may trigger a crash in talloc_get_size() when talloc detects that the passed-in pointer is not a valid talloc pointer. With an RPC worker process shared among multiple client connections, a malicious client or attacker can trigger a process crash in a shared RPC mdssvc worker process, affecting all other clients this worker serves.

Notes

AuthorNote
sbeattie
Spotlight functionality first enabled in 4.13.x in Ubuntu
(so focal), in older releases the Spotlight service is not built.

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
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)
bionic Not vulnerable
(code not build)
trusty Not vulnerable
(code not build)
xenial Not vulnerable
(code not build)
mantic
Released (2:4.18.5+dfsg-1ubuntu1)

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L