Afs3-fileserver Exploit Best File
Remote Code Execution (e.g., EternalBlue), NTLM relay attacks Disable SMBv1, Enforce SMB signing & encryption 2049 (TCP/UDP)
Due to improper authentication or flaws in the protocols, unauthorized users might access, modify, or delete sensitive files.
Many classic AFS vulnerabilities arose from improper handling of RPC packets. If the afs3-fileserver fails to properly validate the length of data received in a packet (e.g., in a FetchData or StoreData operation), it may create a buffer overflow, potentially allowing for remote code execution (RCE).
The service is the core component of the Andrew File System, responsible for handling file requests on port 7000 . Historically, vulnerabilities in AFS implementations have allowed for remote code execution (RCE) , unauthorized access , or privilege escalation . Modern risks often involve misconfigurations where the service is exposed to the public internet, or legacy systems running unpatched versions of OpenAFS. 2. Technical Context Default Port : 7000 (UDP/TCP). Protocol : AFS-3 uses the Rx RPC protocol for communication. Implementations : OpenAFS : The most common open-source version. afs3-fileserver exploit
| CVE ID | Vulnerability Type | Impact | Affected Versions (Some Examples) | | :--- | :--- | :--- | :--- | | CVE-2021-47366 | Data Corruption / Logic Flaw | Incorrect data read from files >2GB due to sign-extension flaw. | Linux kernel's AFS client | | CVE-2024-10397 | Buffer Overflow | Denial of Service (DoS) & Potential RCE via malformed XDR responses. | OpenAFS before 1.8.10 | | CVE-2024-10396 | Input Validation | Fileserver crash, uninitialized memory leak, audit log corruption via malformed ACLs. | OpenAFS before 1.8.10 | | CVE-2013-1794 | Buffer Overflow | Remote DoS & Potential RCE via long fileserver ACL entries. | OpenAFS < 1.6.2 | | CVE-2009-1250 | Logic Flaw / Race Condition | Privilege escalation by spoofing "setuid" attribute on files. | OpenAFS Clients: 1.0 - 1.4.8 | | CVE-2007-6599 | Race Condition (Host_glock) | Remote Denial of Service (daemon crash) in the fileserver. | OpenAFS 1.3.50 - 1.4.5 | | CVE-2007-1507 | Design Error (Setuid) | Default configuration allowed spoofed responses to set "setuid" bits, leading to privilege escalation. | OpenAFS 1.4.x (<1.4.4) & 1.5.x (<1.5.17) | | DSA-1271-1 | Protocol Design Error | Forged FetchStatus call can make a binary appear setuid, enabling privilege escalation. | OpenAFS versions prior to 1.3.81-3sarge2 | | OESA-2024-1737 | Memory Corruption | Potential local privilege escalation or DoS. | Linux Kernel |
Regularly update your OpenAFS server to the latest stable version. Vulnerabilities like CVE-2021-47366 are fixed in updated kernels and packages.
While "afs3-fileserver" is the official service name for port 7000, many older systems (Mac OS X) used this port for the service. A famous exploit associated with this involves a pre-authentication stack buffer overflow. Remote Code Execution (e
🛡️ OpenAFS 1.8.10+ added bounds checking and Rx packet validation—but patching AFS cells is notoriously slow (some run kernels from 2012). Many sites remain vulnerable today.
The single most important action is rigorous patch management. The vulnerabilities described above are fixed in specific OpenAFS versions:
The AFS3 file server exploit has significant implications for organizations that rely on AFS3 for file sharing and storage. If left unpatched, the vulnerability can be exploited by attackers to gain unauthorized access to sensitive data, potentially leading to data breaches, intellectual property theft, and reputational damage. The service is the core component of the
Background
Beginning in macOS 12 Monterey, Apple configured its integrated AirPlay Receiver feature to listen natively on Port 7000 .
Attackers consume server resources by abusing unbounded array types in RPC input variables, forcing the server to wait for data, effectively denying service to legitimate users.