Samba nmbd unstrcpy Buffer Overflow (Aug 22, 2014)
Samba, which runs on most Unix and Unix-like systems, is a free software re-implementation of the SMB/CIFS networking protocol. Samba provides file and print services for various Microsoft Windows clients and can integrate with a Windows Server domain.
SMB/CIFS runs on top of NetBIOS, which provides three distinct services: Name service (NetBIOS-NS), Datagram distribution service (NetBIOS-DGM) and Session service (NetBIOS-SSN). Samba implements the NetBIOS-NS protocol using the “nmbd” daemon. A heap buffer overflow vulnerability exists in Samba’s nmbd daemon. Specifically, the vulnerability is due to “sizeof” operation on an incorrect variable in the “unstrcpy” macro. A remote attacker can exploit this vulnerability by sending crafted requests to the target Samba server. Successful exploitation would cause arbitrary code execution or result in denial-of-service condition. The vulnerability has been assigned as CVE-2014-3560. Dell SonicWALL has released an IPS signature to detect and block specific exploitation attempts targeting this vulnerability. The signature is listed below:- 5082 Samba nmbd unstrcpy Buffer Overflow
The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.
