From security-officer@netbsd.org Wed Nov 20 23:17:21 2002 From: NetBSD Security Officer To: full-disclosure@lists.netsys.com Date: Wed, 20 Nov 2002 02:22:03 +0900 Subject: [Full-Disclosure] NetBSD Security Advisory 2002-028: Buffer overrun in getnetbyname/getnetbyaddr -----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 2002-028 ================================= Topic: Buffer overrun in getnetbyname/getnetbyaddr Version: NetBSD-current: source prior to November 15, 2002 NetBSD 1.6: affected NetBSD-1.5.3: affected NetBSD-1.5.2: affected NetBSD-1.5.1: affected NetBSD-1.5: affected everity: Possible remote root compromise Fixed: NetBSD-current: November 15, 2002 NetBSD-1.6 branch: November 16, 2002 NetBSD-1.5 branch: November 16, 2002 Abstract ======== getnetbyname(3) and getnetbyaddr(3) lacked important boundary checks, and are vulnerable to malicious DNS responses, which could cause a buffer overrun on the stack. The vulnerability could cause a remote root compromise, if a privileged process uses these library functions. Technical Details ================= http://www.isc.org/products/BIND/bind-security.html See the section named: "LIBRESOLV: buffer overrun" Solutions and Workarounds ========================= Since the issue is in libc, all statically-linked binaries have to be rebuilt. Any binary that is statically linked against a vulnerable version of libc must be rebuilt. This includes binaries built by the pkgsrc system. Any binary that depends on libc with an older major number (compiled before 1997) should be removed. The following instructions describe how to upgrade your libc binaries by updating your source tree and rebuilding and installing a new version of libc. * NetBSD-current: Systems running NetBSD-current dated from before 2002-11-15 should be upgraded to NetBSD-current dated 2002-11-15 or later. The following directories need to be updated from the netbsd-current CVS branch (aka HEAD): lib/libc/net/getnetnamadr.c To update from CVS, re-build, and re-install libc and statically-linked binaries: # cd src # cvs update -d -P lib/libc/net/getnetnamadr.c # cd lib/libc # make obj dependall # make install # cd ../../rescue # make obj dependall # make install # cd ../sbin/verifiedexec_load # make obj dependall # make install * NetBSD 1.6: Systems running NetBSD 1.6 dated from before 2002-11-16 should be upgraded to NetBSD 1.6 dated 2002-11-16 or later. The following directories need to be updated from the netbsd-1-6 CVS branch: lib/libc/net/getnetnamadr.c To update from CVS, re-build, and re-install libc and statically-linked binaries: # cd src # cvs update -d -P -r netbsd-1-6 lib/libc/net/getnetnamadr.c # cd lib/libc # make obj dependall # make install # cd ../../bin # make obj dependall # make install # cd ../sbin # make obj dependall # make install * NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3: Systems running NetBSD 1.5, 1.5.1, 1.5.2 or 1.5.3 dated from before 2002-11-16 should be upgraded to NetBSD 1.6 dated 2002-11-16 or later. The following directories need to be updated from the netbsd-1-5 CVS branch: lib/libc/net/getnetnamadr.c To update from CVS, re-build, and re-install libc and statically-linked binaries: # cd src # cvs update -d -P -r netbsd-1-5 lib/libc/net/getnetnamadr.c # cd lib/libc # make obj dependall # make install # cd ../../bin # make obj dependall # make install # cd ../sbin # make obj dependall # make install Revision History ================ 2002-11-20 Initial release More Information ================ Advisories may be updated as new information becomes available. The most recent version of this advisory (PGP signed) can be found at ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2002-028.txt.asc Information about NetBSD and NetBSD security can be found at http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/. Copyright 2002, The NetBSD Foundation, Inc. All Rights Reserved. $NetBSD: NetBSD-SA2002-028.txt,v 1.8 2002/11/19 16:50:45 david Exp $ -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQCVAwUBPdpxhD5Ru2/4N2IFAQHVwAP/Vs3uaJBDJR0zY+iq9ZT/1Fis+4Cia2Jp N/aj2NyDYOaUssIgV/V5UVg0CwT79DRmX90AwIs073DlcoO1LIZrtufGnexerRP/ eZQ8h7uE4NsG4M/MZ2gMvE0+N5NAyPy1l+JNjNeHghw48asitI54nGWMFO5L63yv VKxCTFtsFYE= =WRbF -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html