The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5525 advisory.

  - A path traversal vulnerability was identified in Samba when processing client pipe names connecting to     Unix domain sockets within a private directory. Samba typically uses this mechanism to connect SMB clients     to remote procedure call (RPC) services like SAMR LSA or SPOOLSS, which Samba initiates on demand.
    However, due to inadequate sanitization of incoming client pipe names, allowing a client to send a pipe     name containing Unix directory traversal characters (../). This could result in SMB clients connecting as     root to Unix domain sockets outside the private directory. If an attacker or client managed to send a pipe     name resolving to an external service using an existing Unix domain socket, it could potentially lead to     unauthorized access to the service and consequential adverse events, including compromise or service     crashes. (CVE-2023-3961)

  - A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with     read-only permissions when the Samba VFS module acl_xattr is configured with acl_xattr:ignore system     acls = yes. The SMB protocol allows opening files when the client requests read-only access but then     implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create     disposition request. The issue arises in configurations that bypass kernel file system permissions checks,     relying solely on Samba's permissions. (CVE-2023-4091)

  - A design flaw was found in Samba's DirSync control implementation, which exposes passwords and secrets in     Active Directory to privileged users and Read-Only Domain Controllers (RODCs). This flaw allows RODCs and     users possessing the GET_CHANGES right to access all attributes, including sensitive secrets and     passwords. Even in a default setup, RODC DC accounts, which should only replicate some passwords, can gain     access to all domain secrets, including the vital krbtgt, effectively eliminating the RODC / DC     distinction. Furthermore, the vulnerability fails to account for error conditions (fail open), like out-     of-memory situations, potentially granting access to secret attributes, even under low-privileged attacker     influence. (CVE-2023-4154)

  - A vulnerability was found in Samba's rpcecho development server, a non-Windows RPC server used to test     Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked     indefinitely. The issue arises because the rpcecho service operates with only one worker in the main RPC     task, allowing calls to the rpcecho server to be blocked for a specified time, causing service     disruptions. This disruption is triggered by a sleep() call in the dcesrv_echo_TestSleep() function     under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls     to the rpcecho server, requesting it to block for a specified duration, effectively disrupting most     services and leading to a complete denial of service on the AD DC. The DoS affects all other services as     rpcecho runs in the main RPC task. (CVE-2023-42669)

  - A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners     can be initiated, causing disruptions in the AD DC service. When Samba's RPC server experiences a high     load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation classic     DCs) can erroneously start and compete for the same unix domain sockets. This issue leads to partial     query responses from the AD DC, causing issues such as The procedure number is out of range when using     tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services.
    (CVE-2023-42670)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Debian DSA-5525-1 : samba - security update

critical Nessus Plugin ID 182941

Version 1.2