Sockfd = socket(AF_INET, SOCK_STREAM, 0) Memcpy(buf + offset, args, strlen(args) + 1) Memcpy(buf + offset, path, strlen(path) + 1) īuf = (strlen(args) & 0xFF) + 1 If(write(fd, _private_tmp_sudoers_dmg, _private_tmp_sudoers_dmg_len) != _private_tmp_sudoers_dmg_len) Int main(int argc, char *argv, char *envp) Unsigned int _private_tmp_sudoers_dmg_len = 27052 #define CMD_TO_EXEC "sudo -s - 'hdiutil eject -force /private/etc rm -rf /private/tmp/*.log su -'"Įxtern unsigned char _private_tmp_sudoers_dmg #define EXEC_ARGS DMG_PATH " -owners on -mountpoint " MOUNT_POINT #define EXEC_PATH "/opt/cisco/anyconnect/bin/vpndownloader.app/Contents/Resources/install-dmg.sh" #define DMG_PATH "/private/tmp/sudoers.dmg"
#Cisco anyconnect dmg download install#
* Cisco An圜onnect elevation of privileges via DMG install script - proof of concept abuse the hdiutil attach flaw to mount the DMG file to /private/etc execute install-dmg.sh with the DMG file as argument. create a DMG file containing a sudoers file that allows anyone in the everyone group to invoke sudo without providing a password. The following proof of concept will start a root shell on an affected system using the following steps: Due to this it is possible to change the system's configuration and gain root privileges.
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Consequently an attacker can mount a DMG file at an arbitrary mount point. Using a space character it is possible to add extra arguments to the hdiutil attach command. HDIDOUT=`hdiutil attach $ variable contains user-supplied input. The flaw exists in the following command: The command for mounting the DMG contains a flaw, which still allows a local attacker to abuse the script and gain root privileges. The path is however prepended with a new-line character that cause installer to throw an error - instead of installing the PKG file. After the DMG file is mounted, its path is supplied to the installer program. However, the script appears to be broken. In theory an attacker could create a DMG file containing a specially crafted PKG file that can be installed via An圜onnect. PKG files are only installed if they are named: This script allows a PKG file, located in a DMG file, to be installed as root. One of the executables that can be invoked is install-dmg.sh, which is located in /opt/cisco/anyconnect/bin/vpndownloader.app/Contents/Resources/. An圜onnect restricts which executables can be invoked to prevent a local attacker from gaining elevated privileges. One command is interesting as it can be used to invoke executables with elevated privileges.
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It allows for local processes to connect to it and send commands to it. Updates are expected to be releasedĬisco has released bug ID CSCuv11947 for registered users, whichĬontains additional details and an up-to-date list of affected productĬisco An圜onnect comes with a system service listening on the loopback interface. This issue was successfully verified on Cisco An圜onnect Secure Mobility Similar issue also exists in Cisco An圜onnect Secure Mobility Client for Possible for the attacker to gain root privileges. Vulnerability that allows local attackers to mount arbitrary DMG filesĪt arbitrary mount points.
#Cisco anyconnect dmg download download#
Change Mirror Download -Ĭisco An圜onnect elevation of privileges via DMG install scriptĬisco An圜onnect Secure Mobility Client for OS X is affected by a