GVM Version 20 Doesn't Detect NMAP on Debian 10 about gvm_install HOT 12 OPEN

Gotcha, Okay, cool.

Given how quickly the scans complete I'm skeptical that the issue is with the timeout setting so that leaves the scan config not including a port scanner. Sure enough, when I cloned a copy of the 'Full and Fast' scan config then took a look at it in the edit screen the 'Port Scanners' line was unchecked (see screenshot below).

So, I checked off the box, then clicked to edit the line and checked off the box for 'NMAP (NASL wrapper).

When I changed the task to use the cloned scan config it appears to be working as expected.

So, now I at least know what's going on. I'm not sure why it's unchecked in the default Full & Fast scan config; more importantly, I'm not sure yet how to change it as that config is read-only. I'll poke around with it a bit more but I wanted to document what I've got so far 👍

kev.

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Humm, okay, so there's something else going on here as there're no errors reported in the report for the scans done from that instance. What was leading me there was this output in the results:

The Solutions section below where the screenshot cuts off says:

Solution Type:
Based on the script output please:

• add a Port scanner plugin from the 'Port scanners' family to this scan
  configuration. Recommended: Nmap (NASL wrapper).

• either choose a port range for this target containing less ports or raise
  the 'scanner_plugins_timeout' scanner preference to a higher timeout.

• install the 'nmap' binary/package or make it accessible to the scanner.

It's in the unfiltered results tab rather than in the error tab though.

kev.

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Had the same issue using Kali 2021.2 with GVM 20.8.0, this fix worked well, thanks!

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This has been bothering me literally all day, so glad I found this post, I just wish there was a way to make it more visible for more people to find it quicker!
I'm on Parrot OS, and working my way through the metasploit unleashed course, didn't want to use the Nexpose vulnerability scanner.

Such a simple and elegant solution to a rather annoying error.

Many thanks [yu210148], and all who helped :-)

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A bit more info here; I've tried compiling and installing the 7.80 version of nmap which is the same version as gets installed on Ubuntu 20.04 and it appears to have had no effect. I also tried with the latest 7.91 version. Don't have a solution yet but I'm guessing it might be a path related thing rather than having to do with the version of nmap.

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A missing / not accessible / too new / too old nmap isn't the problem here. In that case you would get an additional output from the mentioned VT including the following:

• The "nmap" binary/package is not installed or not accessible by the scanner.

I guess it's one of the two mentioned problems, have you verified both? (e.g. check the "Error messages" tab in the scan task you have seen that result).

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The important part is the following:

Based on the script output please:

If nmap is missing the following text would be included in the script output (the description of a NASL can't be changed during run time so this approach had to be chosen) which isn't the case based on your provided screenshot:

if( ! get_kb_item( "Tools/Present/nmap" ) ) {
  report += '\n - The "nmap" binary/package is not installed or not accessible by the scanner.';
}

(see 2018/gb_portscanner_missing.nasl)

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Interestingly, this doesn't seem to affect GVM version 21 on Debian 10. I did a test install and scan with it earlier today and it worked as expected.

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Wow after hours of banging my head against a wall with this problem, I came across your post and it fixed everything perfectly. Seems it was the default Full and Fast scan all along. Thanks Kev!

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Yahh its works well.

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