CVE-2023-34967: Samba: type confusion in mdssvc rpc service for spotlight

Vulnerability summary

CVE-2023-34967 is a medium (CVSS 5.3) vulnerability in debian debian_linux. EPSS estimates a 61.20% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.

Timeline

1. 20-07-2023
   PublishedVulnerability first disclosed.
2. 20-11-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-843Access of Resource Using Incompatible TypeThe product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.