Date: Wed, 24 Sep 2008 14:19:42 -0400 (EDT) From: "Steven M. Christey" <coley@...us.mitre.org> To: oss-security@...ts.openwall.com cc: coley@...re.org Subject: Re: CVE request: kernel: open() call allows setgid bit when user is not in new file's group On Wed, 24 Sep 2008, Eugene Teo wrote: > "When creating a file, open()/creat() allows the setgid bit to be set > via the mode argument even when, due to the bsdgroups mount option or > the file being created in a setgid directory, the new file's group is > one which the user is not a member of. The user can then use > ftruncate() and memory-mapped I/O to turn the new file into an arbitrary > binary and thus gain the privileges of this group, since these > operations do not clear the setgid bit." Use CVE-2008-4210, to be filled in later. - Steve
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