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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/30842] Stack read overflow in getaddrinfo in no-aaaa
 mode (CVE-2023-4527)
Date: Wed, 13 Sep 2023 12:11:31 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30842

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Florian Weimer <fw@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3Dbd77dd7e73e3530203b=
e1c52c8a29d08270cb25d

commit bd77dd7e73e3530203be1c52c8a29d08270cb25d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Sep 13 14:10:56 2023 +0200

    CVE-2023-4527: Stack read overflow with large TCP responses in no-aaaa =
mode

    Without passing alt_dns_packet_buffer, __res_context_search can only
    store 2048 bytes (what fits into dns_packet_buffer).  However,
    the function returns the total packet size, and the subsequent
    DNS parsing code in _nss_dns_gethostbyname4_r reads beyond the end
    of the stack-allocated buffer.

    Fixes commit f282cdbe7f436c75864e5640a4 ("resolv: Implement no-aaaa
    stub resolver option") and bug 30842.

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