Vulnerabilities in NFS Shares World Readable is a High risk vulnerability that is one of the most frequently found on networks around the world. This issue has been around since at least 1990 but has proven either difficult to detect, difficult to resolve or prone to being overlooked entirely.
| Vulnerability Name: | NFS Shares World Readable |
|---|---|
| Test ID: | 11994 |
| Risk: | High |
| Category: | NFS Services |
| Type: | Attack |
| Summary: | The remote NFS server is exporting one or more shares without restricting access (based on hostname, IP, or IP range). $OUTPUT |
| Impact: | No access restrictions. |
| Solution: | Place the appropriate restrictions on all NFS shares. |
| CVE: | CVE-1999-1546 |
| More information: | http://www.tldp.org/HOWTO/NFS-HOWTO/security.html |
Scanning For and Finding Vulnerabilities in NFS Shares World Readable
Use of Vulnerability Management tools, like Fortra Vulnerability Management (Fortra VM), are standard practice for the discovery of this vulnerability. The primary failure of VA in finding this vulnerability is related to setting the proper scope and frequency of network scans. It is vital that the broadest range of hosts (active IPs) possible are scanned and that scanning is done frequently. We recommend weekly. Your existing scanning solution or set of test tools should make this not just possible, but easy and affordable.
Penetration Testing (pentest) for this Vulnerability
The NFS Shares World Readable is prone to false positive reports by most vulnerability assessment solutions. Fortra VM uses behavior based testing that eliminates this issue. For all other VA tools security consultants will recommend confirmation by direct observation. In any case Penetration testing procedures for discovery of NFS Shares World Readable produces the highest discovery accuracy rate, but the infrequency of this expensive form of testing degrades its value. The ideal would be to have pentesting accuracy and the frequency and scope possibilities of VA solutions.
Security Updates on Vulnerabilities in NFS Shares World Readable
Given that this is one of the most frequently found vulnerabilities, there is ample information regarding mitigation online and very good reason to get it fixed. Hackers are also aware that this is a frequently found vulnerability and so its discovery and repair is that much more important. It is so well known and common that any network that has it present and unmitigated indicates "low hanging fruit" to attackers.
Disclosures related to this vulnerability
https://www.w3.org/Security/faq/wwwsf3.html
Patching/Repairing this Vulnerability
https://labs.securitycompass.com/web-applications/5-common-linux-misconfigurations/
Vulnerabilities in NFS Shares World Readable is a High risk vulnerability that is also high frequency and high visibility. This is the most severe combination of security factors that exists and it is extremely important to find it on your network and fix it as soon as possible.
Exploits related to Vulnerabilities in NFS Shares World Readable
- https://pentestlab.wordpress.com/2013/01/20/nfs-misconfiguration/
- https://vulners.com/nessus/NFS_WORLD_READABLE_SHARES.NASL
- https://www.scribd.com/doc/92697163/Vulnerability-Remediation-Synopsis