Facebook Google Plus Twitter LinkedIn YouTube RSS Menu Search Resource - BlogResource - WebinarResource - ReportResource - Eventicons_066 icons_067icons_068icons_069icons_070

[R1] Mikrotik RouterOS Multiple Authenticated Vulnerabilities

Critical
← View More Research Advisories

Synopsis

Tenable has discovered multiple authenticated vulnerabilities in Mikrotik's RouterOS.

CVE-2018-1156: Stack buffer overflow in licupgr

The licupgr binary has a sprintf call that an authenticated user can use to trigger a remote stack buffer overflow. The sprintf is used on the following string:

GET /ssl_conn.php?usrname=%s&passwd=%s&softid=%s&level=%d&pay_type=%d&board=%d HTTP/1.0

Where the user has control of the username and password strings. Tenable's proof of concept results in the following crash dump:

2018.05.25-10:57:13.72@0: /nova/bin/licupgr
2018.05.25-10:57:13.72@0: --- signal=11 --------------------------------------------
2018.05.25-10:57:13.72@0: 
2018.05.25-10:57:13.72@0: eip=0x41414141 eflags=0x00010202
2018.05.25-10:57:13.72@0: edi=0x41414141 esi=0x41414141 ebp=0x41414141 esp=0x7fb052d0
2018.05.25-10:57:13.72@0: eax=0x7fb0532c ebx=0x41414141 ecx=0x00000899 edx=0x00000001
2018.05.25-10:57:13.72@0: 
2018.05.25-10:57:13.72@0: maps:
2018.05.25-10:57:13.72@0: 08048000-0804d000 r-xp 00000000 00:0b 1101       /nova/bin/licupgr
2018.05.25-10:57:13.72@0: 77547000-7757c000 r-xp 00000000 00:0b 997        /lib/libuClibc-0.9.33.2.so
2018.05.25-10:57:13.72@0: 77580000-7759a000 r-xp 00000000 00:0b 993        /lib/libgcc_s.so.1
2018.05.25-10:57:13.72@0: 7759b000-775aa000 r-xp 00000000 00:0b 977        /lib/libuc++.so
2018.05.25-10:57:13.72@0: 775ab000-775ad000 r-xp 00000000 00:0b 992        /lib/libdl-0.9.33.2.so
2018.05.25-10:57:13.72@0: 775af000-776f7000 r-xp 00000000 00:0b 987        /lib/libcrypto.so.1.0.0
2018.05.25-10:57:13.72@0: 77706000-7774a000 r-xp 00000000 00:0b 989        /lib/libssl.so.1.0.0
2018.05.25-10:57:13.72@0: 7774e000-77799000 r-xp 00000000 00:0b 979        /lib/libumsg.so
2018.05.25-10:57:13.72@0: 7779f000-777a6000 r-xp 00000000 00:0b 991        /lib/ld-uClibc-0.9.33.2.so
2018.05.25-10:57:13.72@0: 
2018.05.25-10:57:13.72@0: stack: 0x7fb06000 - 0x7fb052d0 
2018.05.25-10:57:13.72@0: 41 41 26 73 6f 66 74 69 64 3d 30 58 59 5a 2d 43 46 5a 52 26 6c 65 76 65 6c 3d 31 26 70 61 79 5f 
2018.05.25-10:57:13.72@0: 74 79 70 65 3d 31 26 62 6f 61 72 64 3d 31 20 48 54 54 50 2f 31 2e 30 0d 0a 41 63 63 65 70 74 3a 
2018.05.25-10:57:13.72@0: 
2018.05.25-10:57:13.72@0: code: 0x41414141

CVE-2018-1157: Memory exhaustion in www

An authenticated user can cause the www binary to consume all memory via a crafted POST request to /jsproxy/upload. When testing our proof of concept on an x86 RouterOS VM, Tenable discovered that this vulnerability didn't just crash www but caused the whole system to reboot.

CVE-2018-1158: Stack exhaustion in www

An authenticated user communicating with the www binary can trigger a stack exhaustion vulnerability via recursive parsing of JSON.

CVE-2018-1159: Memory corruption in www

An authenticated user can cause memory corruption in the www binary by rapidly authenticating and disconnecting. Tenable's proof of concept generates the following crash dump. Note that due to the nature of memory corruption this exact stack trace will be very difficult to reproduce:

2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: /nova/bin/www
2018.05.25-11:11:54.39@0: --- signal=11 --------------------------------------------
2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: eip=0x7755a130 eflags=0x00010212
2018.05.25-11:11:54.39@0: edi=0x746e6f43 esi=0x0000007b ebp=0x77588078 esp=0x7758806b
2018.05.25-11:11:54.39@0: eax=0x08063564 ebx=0x7755bbe8 ecx=0x08062a30 edx=0x08062a34
2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: maps:
2018.05.25-11:11:54.39@0: 08048000-0805c000 r-xp 00000000 00:0b 1111       /nova/bin/www
2018.05.25-11:11:54.39@0: 77557000-7755b000 r-xp 00000000 00:0b 980        /lib/libucrypto.so
2018.05.25-11:11:54.39@0: 7755c000-77566000 r-xp 00000000 00:0b 1014       /nova/lib/www/jsproxy.p
2018.05.25-11:11:54.39@0: 77589000-775be000 r-xp 00000000 00:0b 997        /lib/libuClibc-0.9.33.2.so
2018.05.25-11:11:54.39@0: 775c2000-775dc000 r-xp 00000000 00:0b 993        /lib/libgcc_s.so.1
2018.05.25-11:11:54.39@0: 775dd000-775ec000 r-xp 00000000 00:0b 977        /lib/libuc++.so
2018.05.25-11:11:54.39@0: 775ed000-77735000 r-xp 00000000 00:0b 987        /lib/libcrypto.so.1.0.0
2018.05.25-11:11:54.39@0: 77744000-77788000 r-xp 00000000 00:0b 989        /lib/libssl.so.1.0.0
2018.05.25-11:11:54.39@0: 7778c000-7779b000 r-xp 00000000 00:0b 995        /lib/libpthread-0.9.33.2.so
2018.05.25-11:11:54.39@0: 7779f000-777a1000 r-xp 00000000 00:0b 992        /lib/libdl-0.9.33.2.so
2018.05.25-11:11:54.39@0: 777a3000-777a6000 r-xp 00000000 00:0b 981        /lib/libuxml++.so
2018.05.25-11:11:54.39@0: 777a7000-777f2000 r-xp 00000000 00:0b 979        /lib/libumsg.so
2018.05.25-11:11:54.39@0: 777f8000-777ff000 r-xp 00000000 00:0b 991        /lib/ld-uClibc-0.9.33.2.so
2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: stack: 0x7ff2d000 - 0x7758806b 
2018.05.25-11:11:54.39@0: 77 43 6f 6e 74 7b 00 00 00 00 00 00 00 a8 80 58 77 3f a2 55 77 64 35 06 08 0c 36 06 08 26 00 00 
2018.05.25-11:11:54.39@0: 00 20 a2 55 77 f0 80 58 77 ec c4 5e 77 b8 80 58 77 58 62 56 77 64 35 06 08 e8 80 58 77 c8 80 58 
2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: code: 0x7755a130
2018.05.25-11:11:54.39@0: 8a 14 38 88 55 f3 0f b6 fa 8b b0 04 01 00 00 01 
2018.05.25-11:11:54.39@0: 
2018.05.25-11:11:54.39@0: backtrace: 0x7755a130 0x7755a23f 0x77562821 0x77564ef1 0x77565369 0x7756122b 0x080575ef 0x08055d14 0x08055ee9 0x08053df6 0x08053eed 0x77797435 0x777926d2

Solution

Upgrade to RouterOS versions 6.40.9, 6.42.7, or 6.43.

Additional References

https://mikrotik.com/download/changelogs/bugfix-release-tree

Disclosure Timeline

05-25-2018 - Tenable contacted Mikrotik support to find an appropriate security contact.
05-29-2018 - Tenable sent a follow up email to Mikrotik support.
05-29-2018 - Mikrotik responds that support is the appropriate contact.
05-29-2018 - Tenable asks for a public key.
05-29-2018 - Mikrotik provides a public key.
05-29-2018 - Tenable provides a write up and four proof of concepts.
05-31-2018 - Tenable asks Mikrotik if they were able to verify the vulnerabilities.
06-01-2018 - Mikrotik confirms they were able to reproduce the vulnerabilities.
06-19-2018 - Tenable inquires if any fixes went into a recent release (6.42.4).
07-25-2018 - Tenable asks for an update.
08-22-2018 - Mikrotik asks if Tenable allocated CVE ID for the vulnerabilities. Informs Tenable fixes were released in 6.40.9, 6.42.7, and 6.43.
08-22-2018 - Tenable provides CVE ID.

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

Tenable Advisory ID: TRA-2018-21
Credit:
Jacob Baines
CVSSv2 Base / Temporal Score:
9.0 / 7.0
CVSSv2 Vector:
AV:N/AC:L/Au:S/C:C/I:C/A:C
Nessus Plugin ID: 112114
Affected Products:
Mikrotik RouterOS 6.40.8 and below
Mikrotik RouterOS 6.42.6 and below
Risk Factor:
Critical

Advisory Timeline

08-22-2018 - [R1] Initial Release
Try for free Buy now

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable Vulnerability Management trial also includes Tenable Web App Scanning.

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

100 assets

Choose your subscription option:

Buy Now
Try for free Buy now

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable Vulnerability Management trial also includes Tenable Web App Scanning.

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

100 assets

Choose your subscription option:

Buy Now
Try for free Buy now

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable Vulnerability Management trial also includes Tenable Web App Scanning.

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

100 assets

Choose your subscription option:

Buy Now
Try for free Buy now

Try Tenable Web App Scanning

Enjoy full access to our latest web application scanning offering designed for modern applications as part of the Tenable One Exposure Management platform. Safely scan your entire online portfolio for vulnerabilities with a high degree of accuracy without heavy manual effort or disruption to critical web applications. Sign up now.

Your Tenable Web App Scanning trial also includes Tenable Vulnerability Management.

Buy Tenable Web App Scanning

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

5 FQDNs

$3,578

Buy Now

Request a demo of Tenable Security Center

Please fill out this form with your contact information.

A sales representative will contact you shortly to schedule a demo.

* Field is required

Request a demo of Tenable OT Security

Get the Operational Technology security you need.

Reduce the risk you don’t.

Request a demo

Don’t wait for an attack--eliminate risks before they’re exploited.

  • Uncover hidden weaknesses
  • Stop threats before they strike
  • Simplify security
  • Secure hybrid environments

Request a demo of Tenable Cloud Security

Exceptional unified cloud security awaits you!

We’ll show you exactly how Tenable Cloud Security helps you deliver multi-cloud asset discovery, prioritized risk assessments and automated compliance/audit reports.

See
Tenable One
in action

Exposure management for the modern attack surface.

See Tenable Attack Surface Management in action

Know the exposure of every asset on any platform.

Get a demo of Tenable Enclave Security

Please fill out the form with your contact information and a sales representative will contact you shortly to schedule a demo.

Try for free Buy now

Try Tenable Nessus Professional free

Tenable Nessus is the most comprehensive vulnerability scanner on the market today.

NEW - Tenable Nessus Expert
now available

Nessus Expert adds even more features, including external attack surface scanning, and the ability to add domains and scan cloud infrastructure. Click here to Try Nessus Expert.

Fill out the form below to continue with a Nessus Pro trial.

Buy Tenable Nessus Professional

Tenable Nessus is the most comprehensive vulnerability scanner on the market today. Tenable Nessus Professional will help automate the vulnerability scanning process, save time in your compliance cycles and allow you to engage your IT team.

Buy a multi-year license and save. Add Advanced Support for access to phone, community and chat support 24 hours a day, 365 days a year.

Select your license

Buy a multi-year license and save.

Add support and training
Buy Now
Renew an existing license Find a reseller
Try for free Buy now

Try Tenable Nessus Expert free

Built for the modern attack surface, Nessus Expert enables you to see more and protect your organization from vulnerabilities from IT to the cloud.

Already have Tenable Nessus Professional?
Upgrade to Nessus Expert free for 7 days.

Buy Tenable Nessus Expert

Built for the modern attack surface, Nessus Expert enables you to see more and protect your organization from vulnerabilities from IT to the cloud.

Select your license

Buy a multi-year license and save more.

Add support and training
Buy Now
Renew an existing license Find a reseller

Get a demo of Tenable Patch Management

Interested in streamlining security and IT collaboration and shortening the mean time to remediate with automation? Try Tenable Patch Management.