oss-sec mailing list archives
Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync
From: Simon McVittie <smcv () debian org>
Date: Sat, 21 Oct 2017 12:39:34 +0100
On Fri, 20 Oct 2017 at 23:08:14 +0000, Robert Watson wrote:
Okay, so a script adds a symlink to /etc/shadow or something else confidential. Unless they're root, what good does it do them? They can't read it.
In that particular case, it would do an attacker no good. (Unless the web server that will be serving the mirrored content is running as root, but don't do that.) However, there are plenty of files on a system that are readable by the web server, but should not be readable by random people on the Internet. If the same web server has password-protected directories (for example using Apache .htaccess/.htpasswd) then the files with their passwords usually need to be readable by the web server, but should not be served. /etc/passwd is another common example: it doesn't contain actual passwords since shadow passwords became widespread, but having a list of valid usernames available to the public would make life easier for an attacker, and should usually be avoided. smcv
Current thread:
- CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Bastian Blank (Oct 17)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Robert Watson (Oct 18)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Ben Tasker (Oct 18)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Robert Watson (Oct 19)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Seth Arnold (Oct 19)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Robert Watson (Oct 20)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Ben Tasker (Oct 20)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Robert Watson (Oct 21)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Solar Designer (Oct 21)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Robert Watson (Oct 21)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Simon McVittie (Oct 21)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Ben Tasker (Oct 18)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Robert Watson (Oct 18)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Seth Arnold (Oct 20)
- Re: CVE-2017-8805: Unsafe symlinks not filtered in Debian mirror script ftpsync Bastian Blank (Oct 21)