Headline
ABB Cylon Aspect 3.08.01 File Upload MD5 Checksum Bypass
ABB Cylon Aspect version 3.08.01 has a vulnerability in caldavInstall.php, caldavInstallAgendav.php, and caldavUpload.php files, where the presence of an EXPERTMODE parameter activates a badassMode feature. This mode allows an unauthenticated attacker to bypass MD5 checksum validation during file uploads. By enabling badassMode and setting the skipChecksum parameter, the system skips integrity verification, allowing attackers to upload or install altered CalDAV zip files without authentication. This vulnerability permits unauthorized file modifications, potentially exposing the system to tampering or malicious uploads.
ABB Cylon Aspect 3.08.01 (badassMode) File Upload MD5 Checksum BypassVendor: ABB Ltd.Product web page: https://www.global.abbAffected version: NEXUS Series, MATRIX-2 Series, ASPECT-Enterprise, ASPECT-Studio Firmware: <=3.08.01Summary: ASPECT is an award-winning scalable building energy managementand control solution designed to allow users seamless access to theirbuilding data through standard building protocols including smart devices.Desc: The ABB BMS/BAS system has a vulnerability in caldavInstall.php,caldavInstallAgendav.php, and caldavUpload.php files, where the presenceof an EXPERTMODE parameter activates a badassMode feature. This mode allowsan unauthenticated attacker to bypass MD5 checksum validation during fileuploads. By enabling badassMode and setting the skipChecksum parameter, thesystem skips integrity verification, allowing attackers to upload or installaltered CalDAV zip files without authentication. This vulnerability permitsunauthorized file modifications, potentially exposing the system to tamperingor malicious uploads.Tested on: GNU/Linux 3.15.10 (armv7l) GNU/Linux 3.10.0 (x86_64) GNU/Linux 2.6.32 (x86_64) Intel(R) Atom(TM) Processor E3930 @ 1.30GHz Intel(R) Xeon(R) Silver 4208 CPU @ 2.10GHz PHP/7.3.11 PHP/5.6.30 PHP/5.4.16 PHP/4.4.8 PHP/5.3.3 AspectFT Automation Application Server lighttpd/1.4.32 lighttpd/1.4.18 Apache/2.2.15 (CentOS) OpenJDK Runtime Environment (rhel-2.6.22.1.-x86_64) OpenJDK 64-Bit Server VM (build 24.261-b02, mixed mode)Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscienceAdvisory ID: ZSL-2024-5860Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2024-5860.php21.04.2024--$ cat project P R O J E C T .| | | |'| ._____ ___ | | |. |' .---"| _ .-' '-. | | .--'| || | _| | .-'| _.| | || '-__ | | | || | |' | |. | || | | | | || | ____| '-' ' "" '-' '-.' '` |____░▒▓███████▓▒░░▒▓███████▓▒░ ░▒▓██████▓▒░░▒▓█▓▒░▒▓███████▓▒░ ░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓███████▓▒░░▒▓███████▓▒░░▒▓████████▓▒░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓███████▓▒░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓████████▓▒░▒▓██████▓▒░ ░▒▓██████▓▒░ ░▒▓█▓▒░░░░░░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓█▓▒░░░░░░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░░░░░░ ░▒▓██████▓▒░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒▒▓███▓▒░ ░▒▓█▓▒░░░░░░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓█▓▒░░░░░░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░ ░▒▓█▓▒░░░░░░░░▒▓██████▓▒░ ░▒▓██████▓▒░ $ head caldavInstall.php caldavInstallAgendav.php==> caldavInstall.php <==<?php$badassMode = false;if (isset($_GET["EXPERTMODE"])) { $badassMode = true;}?><html><head>==> caldavInstallAgendav.php <==<?php$badassMode = false;if (isset($_GET["EXPERTMODE"])) { $badassMode = true;}?><html><head>1. GET /caldavInstall.php?EXPERTMODE (FE)2. GET /caldavInstallAgendav.php?EXPERTMODE (FE)3. POST /caldavUpload.php -d "skipChecksum=1" (BE)