A local privilege escalation vulnerability exists in the dynamic linker (dyld) of Apple OS X 10.10.x (Yosemite) due to improper validation and handling of the DYLD_PRINT_TO_FILE environment variable. This variable, introduced in OS X 10.10, allows unprivileged users to create or write to arbitrary files as root by exploiting the fact that file descriptors are leaked to child processes of SUID binaries. The vulnerability is not mitigated by standard SUID bit clearing mechanisms and can be exploited to overwrite or append to root-owned files, including SUID root binaries, resulting in full root compromise. The issue is fixed in OS X 10.11 beta but remains unpatched in 10.10.4 and 10.10.5 beta.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module: 'Apple OS X DYLD_PRINT_TO_FILE Privilege Escalation'. The exploit targets a local privilege escalation vulnerability (CVE-2015-3760) in Apple OS X versions 10.10.0 through 10.10.4. The vulnerability allows a local attacker to write arbitrary files as root by abusing the DYLD_PRINT_TO_FILE environment variable with SUID-root binaries. The module uploads a payload binary to a writable directory (default '/.Trashes'), then uses a crafted environment variable to write a line to '/etc/sudoers', granting the attacker passwordless sudo access. The exploit then executes the payload as root, typically resulting in a root shell. The code is written in Ruby and is structured as a standard Metasploit local exploit module, with functions for checking vulnerability, uploading the payload, and executing the exploit. The main fingerprintable endpoints are the '/etc/sudoers' file (target for privilege escalation), '/.Trashes' (payload drop location), and '/bin/sh' (used for command execution).
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