Date: Sat, 28 Sep 2002 21:19:42 +0100 (BST) From: Mark J Cox <mjc@...hat.com> To: xvendor@...ts.openwall.com cc: Paul Eggert <eggert@...nsun.com> Subject: Re: Fwd: GNU tar (Re: Allot Netenforcer problems, GNU TAR flaw) > Paul, -- is there anything more current than tar-1.13.25 (released > over a year ago)? Perhaps a CVS repository? Yes we noticed this problem with ./../ not being caught and told the tar folks. We allocated CAN-2002-0399 for this, wrote a patch, prepared an errata, but waited to see if an official fix was coming. Date: Mon, 27 May 2002 11:44:58 +0100 (BST) From: Mark J Cox <mjc@...hat.com> To: bug-tar@....org, eggert@...nsun.com Cc: teg@...hat.com, bbrock@...hat.com Subject: [SECURITY] bug in contains_dot_dot routine We've recently been looking at the vulnerability mentioned on bugtraq nearly a year ago: "Directory traversal vulnerability in GNU tar 1.13.19 and earlier allows local users overwrite arbitrary files during archive extraction via a tar file whose filenames contain a .. (dot dot)." http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-1267 This was fixed by the routine contains_dot_dot in misc.c in tar, which catches the case where a tar file contains an entry such as "../foo" However during testing of 1.13.25 we found that we could still trigger this problem with an entry such as "./../foo" and this is due to a logic error in misc.c I've attached a small patch that fixes this (I didn't spend time looking to see if multiple ISSLASH are already stripped, if so you could optimize the patch further) Cheers, Mark -- Mark J Cox / Red Hat / OpenSSL / Apache Software Foundation mjc@...hat.com // T: +44 798 061 3110 // F: +44 870 1319174 [ Part 2, "" Text/PLAIN (Name: "tmp1.patch") 6 lines. ] [ Unable to print this part. ]
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