full-disclosure - Security hole in Confixx backup script

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu)
Subject: Security hole in Confixx backup script 

On Tue, 10 Aug 2004 02:16:24 +0200, Thomas Loch said:
> What if someone creates a shell script that simply "cat /etc/shadow" and sets
> the SetUID flag. Then he makes a backup of that file and restores the backup 
> while he prevents the chown-command anyhow. All files will remain "root". 
> Including the script. The execution of this script will print out the 
> shadowed encrypted passwords. This can even be used to chmod the shadow file 
> and make it readable for everyone

You'd probably have to work a *little* harder than a shell script - most
Unixoid systems don't allow the execution of a setUID shell script due to
various and sundry race conditions involved (which is why 'suidperl' exists).
Other than that, you're on the right track.. ;) 

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 226 bytes
Desc: not available
Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20040809/5fe61227/attachment.bin