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NetBSD Security Advisory 1998-001Aleph One (aleph1nationwide.net)
Sun, 10 May 1998 15:46:35 -0500
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-----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 1998-001 --------------------------------- Topic: BIND 4.9.6 vulnerabilities Version: All current versions of NetBSD Severity: Problem may allow remote privileged access, or cause a denial of service. Abstract - -------- Several problems have been found in BIND 4.9.6. One involves a buffer overflow in the inverse query code, which is not enabled by default. The others are similar buffer overflows in the rest of the code. Depending on other site configuration specifics, several of these overflows could contribute to an exploit designed to allow remote super-user access to the system. Technical Details - ----------------- Both of the problems described below are solved in both BIND 4.9.7 and BIND 8.1.2. The BIND 4.9.6 release does not properly bounds check a memory copy when responding to an inverse query request. Improperly or maliciously formatted inverse query requests can cause named to overwrite its' stack, granting root access to a remote attacker. There are also many other occurances of improper bounds checking of memory copy operations, in both named and many of the DNS utilities (eg, dig(1) and nslookup(1)). These problems may cause the server to attempt to read invalid memory locations, causing the server to crash or return garbage answers. Solutions and Workarounds - ------------------------- As NetBSD does not ship with the inverse query option enabled by default, most NetBSD sites will not be affected by this problem. If there is a line containing `fake-iquery' in the /etc/namedb/named.boot, or named has been built with the `INVQ' option defined in the src/usr.sbin/named/conf/options.h file, then the server is vulnerable to this problem. Removing `fake-iquery' from the named.boot or undefining `INVQ' will close this problem immediately. The second problem is only fixed by either patching and rebuilding NetBSD sources with the patch below, or manually upgrading to a newer version of BIND (4.9.7 or 8.1.2). A patch has been made available for NetBSD 1.3 and 1.3.1, and can be found on the NetBSD FTP server: ftp://ftp.NetBSD.ORG/pub/NetBSD/misc/security/patches/19980506-bind Thanks To - --------- Many thanks go to CERT and to the Internet Software Consortium for providing the NetBSD Project with this information. Please see http://www.cert.org/ and http://www.isc.org/ for more information. More Information - ---------------- Information about NetBSD and NetBSD security can be found at http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/. Copyright 1998, The NetBSD Foundation. All Rights Reserved. -----BEGIN PGP SIGNATURE----- Version: 2.6.1 iQCVAwUBNVWbDz5Ru2/4N2IFAQEFOQQAoRD9WpRpGPNLfexAy0r7C7Soyx8QIq7I g6FqGEBegbl/N/kXsRo3bt9ksMW2Ww6EEo+RCh6AnTVzh5FgGsC3wKPLgs8mhjq8 s78QI4HVyrWwcE4mXCZhBSj5xPpqAGLKUhKKaXd4mS1lz0spRkFPDJrLZSwU2z4N P9k+Dcy1W0o= =X8Kn -----END PGP SIGNATURE-----