full-disclosure - Re: [+] Vulnerability in less version 394 and prior

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] [day] [month] [year] [list]

Message-ID: <47280CDB.1060904@freethemallocs.com>
Date: Tue, 30 Oct 2007 21:04:27 -0800
From: Jonathan Smith <smithj@...ethemallocs.com>
To: "glopeda.com" <glopeda@...peda.com>
Cc: full-disclosure@...ts.grok.org.uk, markn@...enwoodsoftware.com
Subject: Re: [+] Vulnerability in less version 394 and
	prior

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

glopeda.com wrote:
> From: glopeda@...peda.com
> Application: less 394 and prior
> Type: Format strings vulnerability
> Priority: Low
> 
> There exists a format strings bug in the less application present in
> most flavors of UNIX.  It could be leveraged for privilege escalation
> if the calling application is setuid/setgid and does not properly drop
> privileges.
> 
> Meager demonstration:
> $ export LESSOPEN=%s%n
> $ less somefile
> Segmentation fault
> $
> 
> See http://www.glopeda.com for more details.


Still some strangeness on the latest version:
smithj@...alhost ~ $  export LESSOPEN=%s%n
smithj@...alhost ~ $  less route.txt
*** %n in writable segment detected ***
Aborted
smithj@...alhost ~ $  conary query less
less=409-1-0.1[is: x86]

Given the details in the original post, I don't think this is a security
issue. If a program doesn't properly shed s{u,g}id bits, that program
should be fixed. This is still a bug, though, so I'm CCing the
maintainer on this email.

	smithj


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.7 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFHKAzbCG91qXPaRekRApAzAJ4mcIN5+vp9IjPWEQKRAP6q4dSl4QCfbkBh
7OPWx46AeHZF/9cGMqrBZHc=
=S7Fs
-----END PGP SIGNATURE-----

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/