[Outofthebox] problema con scponlyc [Risolto]

[isazi]

On Tuesday 21 March 2006 22:46, Lonely Wolf wrote:
> riabilitato?
> in che senso scusa?

Dalla 4.2 in poi:

SECURITY PROBLEM 2, reported by Pekka Pessi: 
If ANY the following conditions are true, administrators using 
scponly-4.1 or older may be at risk of remote scponly users 
circumventing the restricted shell and executing arbitrary programs. 
There is no privilege escalation and this vulnerability is 
post-authentication. 

* scp compatibility is enabled
* rsync compatibility is enabled

Exploit: 
To exploit this vulnerability, a remote scponly user could: 
* construct a malicious command line argument to either the rsync or 
scp. Athough scponly does check for arguments that allow the user to 
specify a program to run, it does not use getopt() style processing to 
locate these potentially malicious arguments. For example, the 
potentially malicious scp argument "-S program" would be detected but 
by combining it with the benevolent "-v" (yielding "-vS program") would 
not.

Fix: 
The new release of scponly-4.2: 
* uses getopt to process the arguments to scp and rsync.
* does not support rsync or scp by default. henceforth, the recommended 
means to use scponly is via sftp

-- 

Alessio "isazi" Sclocco

Metro Olografix Member

http://www.olografix.org/isazi

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