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Secunia Advisory SA18223

scponly Privilege Escalation and Security Bypass Vulnerabilities
Secunia Advisory SA18223
Secunia VIM 4.0 - Free Trial
Release Date 2005-12-23
Last Update 2006-02-13
   
Popularity 9,978 views
Comments 0 comments

Criticality level Less criticalLess critical
Impact Security Bypass
Privilege escalation
Where From remote
Authentication level This information is available to Secunia VIM customers
   
Report reliability This information is available to Secunia VIM customers
Solution Status Vendor Patch
   
Systems affected This information is available to Secunia VIM customers
Approve distribution This information is available to Secunia VIM customers
   
Software:
scponly 3.x
scponly 4.x

Secunia CVSS Score This information is available to Secunia VIM Customers
CVE Reference(s) CVE-2005-4532 CVSS score available to Secunia VIM customers
  

Description

Two vulnerabilities have been reported in scponly, which can be exploited by malicious, local users to gain escalated privileges, or by malicious users to bypass certain security restrictions.

1) A design error in "scponlyc" allows it to be used with arbitrary chroot directories that local users create in their home directories. This can be exploited by malicious users to gain escalated privileges by creating a hardlink to a setuid root binary in their own chroot directory, configuring LD_PRELOAD to overload a call to setuid with a malicious function, and then using "scponlyc" with the malicious chroot directory.

Successful exploitation allows local privilege escalation but requires that the chrooted setuid "scponlyc" binary is installed, a user executable setuid binary exists on the same file system mount as the user's home directory, and the OS supports LD_PRELOAD.

2) An error exists in the validation of user supplied command line. This can be exploited to supply additional command line arguments to rsync or scp, potentially bypassing the restricted shell and allowing the execution of arbitrary programs.

Successful exploitation requires that scp and rsync compatibility is enabled.

The vulnerabilities have been reported in version 4.1 and prior.


Solution
Update to version 4.2.
Further details available to Secunia VIM customers

Provided and/or discovered by
1) Max Vozeler
2) Pekka Pessi

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://sublimation.org/scponly/#relnotes

Deep Links
Links available to Secunia VIM customers


Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: scponly Privilege Escalation and Security Bypass Vulnerabilities
 
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