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[Bug network/19791] res_query.c:262 asserts when dns contains unreachable entries
- From: "fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 10 Mar 2016 15:26:27 +0000
- Subject: [Bug network/19791] res_query.c:262 asserts when dns contains unreachable entries
- Auto-submitted: auto-generated
- References: <bug-19791-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19791
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
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CC| |fweimer at redhat dot com
Flags| |security?
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to priyesh from comment #0)
> res_query.c:262: __libc_res_nquery: Assertion `(hp != ((void *)0)) && (hp2
> != ((void *)0))' failed.
What's the exact glibc version you tested? Current master would print a
different assertion due to commit 8ba14398e629c1f63b9c91a59a47a713b3cce8bc.
> This can be triggered by disabling ipv6, then adding an ipv6 dns and using
> the proof of concept here:
> https://github.com/fjserna/CVE-2015-7547/blob/master/CVE-2015-7547-client.c
How did you disable IPv6? There multiple ways to do this (at least partially).
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