Document Title: =============== SSH Explorer v1.97 - Denial of Service Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=326 CNNVD-201112-149 Release Date: ============= 2011-11-19 Vulnerability Laboratory ID (VL-ID): ==================================== 326 Product & Service Introduction: =============================== Der SSH Explorer ist ein SSH/Telnet Client und Terminal Emulationssoftware, die es ermöglicht die Administration von Linux Servern einfacher zu gestalten. Mit dem File View Panel können Sie durch die Remote Verzeichnisse und Dateien navigieren als wären diese direkt auf Ihrem Computer gespeichert. Der SSH Explorer hat ebenso einen Satz von nützlichen Linux Kommandos integriert, der Ihnen erlaubt komplizierte Befehle zu Skripten, somit müssen Sie diese nicht immer wieder neu tippen. Unterstützt werden eine VT100 Terminal Emulation, SSH1, SSH2 und das Telnet Protokoll. (Copy of the Vendor Homepage: http://www.pcfreunde.de/download/d11544/ssh-explorer/) Abstract Advisory Information: ============================== Vulnerability Lab Team discovered a local Denial of Service vulnerability in SSH Explorer v1.97. Vulnerability Disclosure Timeline: ================================== 2011-11-20: Public or Non-Public Disclosure Discovery Status: ================= Published Exploitation Technique: ======================= Local Severity Level: =============== Medium Technical Details & Description: ================================ A Denial of Service vulnerability is detected in SSH Explorer v1.97. Local attackers can crash the software process via denial of service vulnerability. The bug is located on the groups-name module when processing the content of the snippet list description. Vulnerable Section(s): [+] Snippet List - Description --- Error/Exception Logs --- Problemereignisname: AppHangB1 Anwendungsname: SSHExplorer.exe Anwendungsversion: 0.0.0.0 Anwendungszeitstempel: 2a425e19 Absturzsignatur: 17d3 Absturztyp: 0 Betriebsystemversion: 6.1.7601.2.1.0.768.3 Gebietsschema-ID: 1031 Zusätzliche Absturzsignatur 1: 17d3b5d57715568670c128b2e71cc052 Zusätzliche Absturzsignatur 2: 571d Zusätzliche Absturzsignatur 3: 571db8b6553550ce54cc5b50842649bd Zusätzliche Absturzsignatur 4: 17d3 Zusätzliche Absturzsignatur 5: 17d3b5d57715568670c128b2e71cc052 Zusätzliche Absturzsignatur 6: 571d Zusätzliche Absturzsignatur 7: 571db8b6553550ce54cc5b50842649bd Picture(s): ../1.png ../2.png Proof of Concept (PoC): ======================= The denial of service vulnerability can be exploited by local attackers or local low privileged user accounts. For demonstration or reproduce ... Manually reproduce ... 1. Start the software 2. open the code snippet module and choose a groupname on the list 3. Include a large string & save the input 4. Close the module and open the same section again 5. Result: Service freeze and stable process crash via apphang Report(s): ../AppHang_SSHExplorer.exe_3aae5c5145af76d2e5e3b212656360bfecdba5_0d66dfa8 ../AppHang_SSHExplorer.exe_3aae5c5145af76d2e5e3b212656360bfecdba5_178055c1 ../AppHang_SSHExplorer.exe_7b9ea29e4aab730f258a954f20a06ccd888efa_1e8d9f00 ../AppHang_SSHExplorer.exe_df68e426db7b919656d5ec108bb27dce1813dd82_15d0d240 ../crash-report Solution - Fix & Patch: ======================= Restrict the input with a specific maximum after the save when processing to request the saved same input form. Security Risk: ============== The security risk of the stable local denial of service vulnerability are estimated as medium(-). 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