Plateforme
linux
Composant
samba
Corrigé dans
*
CVE-2023-3961 describes a path traversal vulnerability discovered in Samba. This flaw allows malicious actors to bypass security controls and potentially gain root access on the server. The vulnerability affects Samba versions less than or equal to the last tested version. A fix is available, and immediate patching is strongly recommended.
This vulnerability poses a significant risk because it allows an attacker to bypass directory restrictions and connect as root to Unix domain sockets. Successful exploitation could grant an attacker complete control over the affected Samba server, enabling them to read sensitive data, modify system configurations, install malware, and potentially pivot to other systems on the network. The ability to connect as root dramatically expands the attack surface and increases the potential for widespread damage. This vulnerability shares similarities with other path traversal exploits where inadequate input validation allows attackers to navigate outside of intended directories.
CVE-2023-3961 was publicly disclosed on November 3, 2023. The vulnerability has a CRITICAL CVSS score of 9.1. Public proof-of-concept exploits are likely to emerge, increasing the risk of widespread exploitation. It is currently not listed on the CISA KEV catalog, but its severity warrants close monitoring. Active exploitation campaigns are possible given the ease of exploitation and the potential impact.
Organizations running Samba file servers, particularly those with legacy configurations or shared hosting environments, are at significant risk. Systems that rely on Samba for authentication or file sharing are also vulnerable. Environments with weak network segmentation or inadequate access controls are especially susceptible to exploitation.
• linux / server:
journalctl -u smbd -g 'pipe name contains ../'• linux / server:
ps aux | grep smbd | grep '../'• linux / server:
find / -path '*\..*' -name 'smbd' 2>/dev/nulldisclosure
Statut de l'Exploit
EPSS
1.94% (percentile 83%)
Vecteur CVSS
The primary mitigation is to upgrade to a patched version of Samba. If immediate patching is not feasible, consider implementing temporary workarounds. These may include restricting network access to the Samba server, implementing strict firewall rules to limit connections, and carefully reviewing Samba configuration files to ensure proper directory permissions. Monitoring Samba logs for unusual connection attempts or directory access patterns can also help detect potential exploitation. After upgrade, confirm the fix by attempting a connection with a crafted pipe name containing directory traversal characters and verifying that the connection is rejected.
Mettez à jour Samba vers la dernière version disponible fournie par Red Hat. Consultez les avis de sécurité de Red Hat (RHSA-2023:6209, RHSA-2023:6744, RHSA-2023:7371) pour obtenir des instructions de mise à jour spécifiques à votre version de Red Hat Enterprise Linux.
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CVE-2023-3961 is a critical path traversal vulnerability in Samba that allows attackers to potentially gain root access by manipulating client pipe names.
Yes, if you are running Samba versions less than or equal to the last tested version, you are potentially affected by this vulnerability.
Upgrade to a patched version of Samba as soon as possible. If patching is not immediately possible, implement temporary workarounds like restricting network access and monitoring logs.
While no active exploitation has been confirmed, the vulnerability's severity and ease of exploitation suggest that active campaigns are possible.
Refer to the official Samba security advisory for detailed information and mitigation guidance: [https://www.samba.org/samba/security/](https://www.samba.org/samba/security/)
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