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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/28091] New: nss_name_skip may return 0 for domain names
 without terminator
Date: Thu, 15 Jul 2021 07:40:05 +0000
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X-Bugzilla-Version: 2.34
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28091

            Bug ID: 28091
           Summary: nss_name_skip may return 0 for domain names without
                    terminator
           Product: glibc
           Version: 2.34
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

ns_name_skip returns 0 (indicating success) for a buffer that contains the =
two
bytes 1, 1 (no terminating null label or compression indicator).  Callers
probably expect that the function reports failure because the message is
corrupted.

I do not think this is a security vulnerability because in typical packet
layouts, a two-byte item follows the domain name, so the caller has to perf=
orm
a separate length check for the remaining buffer anyway.

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