Re: ISC DHCP Client [3.0.x to 4.2.x] Arbitrary Command Execution (CVE-2011-0997)

[Valdis.Kletnieks () vt edu]

On Wed, 06 Apr 2011 14:01:58 EDT, Ryan Sears said:

> https://www.isc.org/software/dhcp/advisories/cve-2011-0997

Seems a tad buggy in the mitigation section:

new_host_name=${new_host_name//[^a-zA-Z0-9]/}

I suspect they wanted:

new_host_name=${new_host_name//[^-.a-zA-Z0-9]/}

Otherwise if a valid dhcp server hands you foo.bar.baz.example.com your hostname
just became foobarbazexamplecom - whoops.  Oh, and - just because that's valid in a
hostname too...

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