Document Title: =============== WebWatchBot Monitor 5.1.16 - Divide Zero Vulnerability Release Date: ============= 2011-09-05 Vulnerability Laboratory ID (VL-ID): ==================================== 7 Common Vulnerability Scoring System: ==================================== 3.5 Product & Service Introduction: =============================== Performance Monitoring Software for Websites, Servers and Infrastructure Continuous website, server and infrastructure monitoring is critical to ensuring that your website and web-based applications are available and performing with acceptable response times. WebWatchBot 5.0 is the leading website and server monitoring software solution for real-time performance awareness and problem notification (Copy of the Vendor Homepage: http://www.exclamationsoft.com/webwatchbot/) Abstract Advisory Information: ============================== Vulnerability-Lab Research Team discovered a Divide by Zero Vulnerability in the WebWatchBot Monitoring Software. Vulnerability Disclosure Timeline: ================================== 2011-07-31: Discovery by Vulnerability-Lab Discovery Status: ================= Published Affected Product(s): ==================== ExclamationSoft Product: WebWatchBot 5.1.16 Exploitation Technique: ======================= Local Severity Level: =============== Low Technical Details & Description: ================================ A devide by zero bug is detected on the webwatchbot v5.1.16 monitor security software. A validation/calculation mistake on the Watch Item Name module allows an attacker to crash the software stable via integer devide by zero bug. After the crash the software can not be restored & needs a new installation on the system. Vulnerable Module(s): [+] Watch Item Name --- Error Logs --- Problemsignatur Problemereignisame: APPCRASH Anwendungsname: WWBGui.exe Anwendungsversion: 5.1.11.0 Anwendungszeitstempel: 4ad4d142 Fehlermodulname: WWBGui.exe Fehlermodulversion: 5.1.11.0 Fehlermodulzeitstempel: 4ad4d142 Ausnahmecode: c0000005 Ausnahmeoffset: 0005adf3 Betriebsystemversion: 6.0.6002.2.2.0.768.3 Gebietsschema-ID: 1031 Zusatzinformation 1: 548d Zusatzinformation 2: f1d9ae1d9e344996d3f71e37c557d47c Zusatzinformation 3: 3b65 Zusatzinformation 4: 6436551fe7991743a8303abd6bb203a9 --- Debug Exception Logs --- (2388.19cc): Integer divide-by-zero - code c0000094 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=635f5ea6 ebx=00000001 ecx=005f0000 edx=00000000 esi=00000000 edi=00001772 eip=0225da3d esp=0012f5ac ebp=0012f5e0 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246 0225da3d f775d0 div eax,dword ptr [ebp-30h] ss:0023:0012f5b0=00000000 Proof of Concept (PoC): ======================= This vulnerability can be exploited by local attackers via restricted user access. For demonstration or reproduce ... Manually reproduce: 1. Go to "Watch Item Name" module on the menu labels 2. Include for example a long negative zer0 strings with a space between 3. Save the configuration of the new item 4. Error reports and problem signatures will be displayed and the result is a classic divide by zero software bug 5. After the startup the software crashs stable and can not be recovered Security Risk: ============== The security risk of the local divide by zero vulnerability is estimated as medium. 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