CVE-2023-34967

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	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	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

sbeattie

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

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
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

References

Related Ubuntu Security Notices (USN)

USN-6238-1
Samba vulnerabilities
19 July 2023