Mikrotik RouterOS 6.46.5 Memory Corruption / Assertion Failure
CVE
Category
Price
Severity
CVE-2020-20214
CWE-119
$5000
High
Author
Risk
Exploitation Type
Date
Unknown
High
Remote
2021-05-10
CPE
cpe:cpe:/o:mikrotik:routeros:6.46.5
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Local AV The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required Low PR The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope S An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021050052 Below is a copy:
Mikrotik RouterOS 6.46.5 Memory Corruption / Assertion Failure Advisory: four vulnerabilities found in MikroTik's RouterOS
Details
=======
Product: MikroTik's RouterOS
Vendor URL: https://mikrotik.com/
Vendor Status: no fix yet
CVE: CVE-2020-20214, CVE-2020-20222, CVE-2020-20236, CVE-2020-20237
Credit: Qian Chen(@cq674350529) of Qihoo 360 Nirvan Team
Product Description
==================
RouterOS is the operating system used on the MikroTik's devices, such as
switch, router and access point.
Description of vulnerabilities
==========================
These vulnerabilities were reported to the vendor almost one year ago. And
the vendor confirmed these vulnerabilities. However, there is still no fix
for them yet.
By the way, the three vulnerabilities in sniffer binary are different from
each one.
1. CVE-2020-20214
The btest process suffers from an assertion failure vulnerability. There is
a reachable assertion in the btest process. By sending a crafted packet, an
authenticated remote user can crash the btest process due to assertion
failure.
Against stable 6.46.5, the poc resulted in the following crash dump.
# cat /rw/logs/backtrace.log
2020.06.19-15:51:36.94@0:
2020.06.19-15:51:36.94@0:
2020.06.19-15:51:36.94@0: /nova/bin/btest
2020.06.19-15:51:36.94@0: --- signal=6
--------------------------------------------
2020.06.19-15:51:36.94@0:
2020.06.19-15:51:36.94@0: eip=0x7772255b eflags=0x00000246
2020.06.19-15:51:36.94@0: edi=0x00fe0001 esi=0x7772a200 ebp=0x7fdcf880
esp=0x7fdcf878
2020.06.19-15:51:36.94@0: eax=0x00000000 ebx=0x0000010f ecx=0x0000010f
edx=0x00000006
2020.06.19-15:51:36.94@0:
2020.06.19-15:51:36.94@0: maps:
2020.06.19-15:51:36.94@0: 08048000-08057000 r-xp 00000000 00:0c 1006
/nova/bin/btest
2020.06.19-15:51:36.94@0: 776f4000-77729000 r-xp 00000000 00:0c 964
/lib/libuClibc-0.9.33.2.so
2020.06.19-15:51:36.94@0: 7772d000-77747000 r-xp 00000000 00:0c 960
/lib/libgcc_s.so.1
2020.06.19-15:51:36.94@0: 77748000-77757000 r-xp 00000000 00:0c 944
/lib/libuc++.so
2020.06.19-15:51:36.94@0: 77758000-77775000 r-xp 00000000 00:0c 947
/lib/libucrypto.so
2020.06.19-15:51:36.94@0: 77776000-777c2000 r-xp 00000000 00:0c 946
/lib/libumsg.so
2020.06.19-15:51:36.94@0: 777c8000-777cf000 r-xp 00000000 00:0c 958
/lib/ld-uClibc-0.9.33.2.so
2020.06.19-15:51:36.94@0:
2020.06.19-15:51:36.94@0: stack: 0x7fdd0000 - 0x7fdcf878
2020.06.19-15:51:36.94@0: 00 a0 72 77 00 a0 72 77 b8 f8 dc 7f 77 e0 71
77 06 00 00 00 00 a2 72 77 20 00 00 00 00 00 00 00
2020.06.19-15:51:36.94@0: 16 00 00 00 18 f9 dc 7f b4 f8 dc 7f e4 2a 7c
77 01 00 00 00 e4 2a 7c 77 16 00 00 00 01 00 fe 00
2020.06.19-15:51:36.94@0:
2020.06.19-15:51:36.94@0: code: 0x7772255b
2020.06.19-15:51:36.94@0: 5b 3d 00 f0 ff ff 76 0e 8b 93 cc ff ff ff f7
d8
This vulnerability was initially found in long-term 6.44.5, and it seems
that the latest stable version 6.48.2 still suffers from this vulnerability.
2. CVE-2020-20222
The sniffer process suffers from a memory corruption vulnerability. By
sending a crafted packet, an authenticated remote user can crash the
sniffer process due to NULL pointer dereference.
Against stable 6.46.5, the poc resulted in the following crash dump.
# cat /rw/logs/backtrace.log
2020.06.19-16:36:18.33@0:
2020.06.19-16:36:18.33@0:
2020.06.19-16:36:18.33@0: /nova/bin/sniffer
2020.06.19-16:36:18.33@0: --- signal=11
--------------------------------------------
2020.06.19-16:36:18.33@0:
2020.06.19-16:36:18.33@0: eip=0x08050e33 eflags=0x00010206
2020.06.19-16:36:18.33@0: edi=0x08057a24 esi=0x7f85c094 ebp=0x7f85c0c8
esp=0x7f85c080
2020.06.19-16:36:18.33@0: eax=0x00000000 ebx=0x7f85c090 ecx=0x00ff0000
edx=0x08059678
2020.06.19-16:36:18.33@0:
2020.06.19-16:36:18.33@0: maps:
2020.06.19-16:36:18.33@0: 08048000-08056000 r-xp 00000000 00:0c 1034
/nova/bin/sniffer
2020.06.19-16:36:18.33@0: 776ce000-77703000 r-xp 00000000 00:0c 964
/lib/libuClibc-0.9.33.2.so
2020.06.19-16:36:18.33@0: 77707000-77721000 r-xp 00000000 00:0c 960
/lib/libgcc_s.so.1
2020.06.19-16:36:18.33@0: 77722000-77731000 r-xp 00000000 00:0c 944
/lib/libuc++.so
2020.06.19-16:36:18.33@0: 77732000-7773a000 r-xp 00000000 00:0c 950
/lib/libubox.so
2020.06.19-16:36:18.33@0: 7773b000-77787000 r-xp 00000000 00:0c 946
/lib/libumsg.so
2020.06.19-16:36:18.33@0: 7778d000-77794000 r-xp 00000000 00:0c 958
/lib/ld-uClibc-0.9.33.2.so
2020.06.19-16:36:18.33@0:
2020.06.19-16:36:18.33@0: stack: 0x7f85d000 - 0x7f85c080
2020.06.19-16:36:18.33@0: 2c 08 07 08 04 00 fe 08 fe 00 00 00 20 ad 05
08 00 0c 07 08 a0 0b 07 08 af 0b 07 08 04 7a 05 08
2020.06.19-16:36:18.33@0: 08 00 00 00 24 7a 05 08 ff 00 00 00 00 00 00
00 08 c2 85 7f e4 7a 78 77 d8 c0 85 7f e4 7a 78 77
2020.06.19-16:36:18.34@0:
2020.06.19-16:36:18.34@0: code: 0x8050e33
2020.06.19-16:36:18.34@0: 0b 48 0c 89 fa 89 d8 e8 7d f1 ff ff 50 50 53
56
This vulnerability was initially found in long-term 6.44.6, and it seems
that the latest stable version 6.48.2 still suffers from this vulnerability.
3. CVE-2020-20236
The sniffer process suffers from a memory corruption vulnerability. By
sending a crafted packet, an authenticated remote user can crash the
sniffer process due to invalid memory access.
Against stable 6.46.5, the poc resulted in the following crash dump.
# cat /rw/logs/backtrace.log
2020.06.19-16:58:33.42@0:
2020.06.19-16:58:33.42@0:
2020.06.19-16:58:33.42@0: /nova/bin/sniffer
2020.06.19-16:58:33.42@0: --- signal=11
--------------------------------------------
2020.06.19-16:58:33.42@0:
2020.06.19-16:58:33.42@0: eip=0x08050dac eflags=0x00010202
2020.06.19-16:58:33.42@0: edi=0x08057a24 esi=0x00000001 ebp=0x7f8df428
esp=0x7f8df3e0
2020.06.19-16:58:33.42@0: eax=0x08073714 ebx=0x08073710 ecx=0x08073704
edx=0x08073714
2020.06.19-16:58:33.42@0:
2020.06.19-16:58:33.42@0: maps:
2020.06.19-16:58:33.42@0: 08048000-08056000 r-xp 00000000 00:0c 1034
/nova/bin/sniffer
2020.06.19-16:58:33.42@0: 77730000-77765000 r-xp 00000000 00:0c 964
/lib/libuClibc-0.9.33.2.so
2020.06.19-16:58:33.42@0: 77769000-77783000 r-xp 00000000 00:0c 960
/lib/libgcc_s.so.1
2020.06.19-16:58:33.42@0: 77784000-77793000 r-xp 00000000 00:0c 944
/lib/libuc++.so
2020.06.19-16:58:33.42@0: 77794000-7779c000 r-xp 00000000 00:0c 950
/lib/libubox.so
2020.06.19-16:58:33.42@0: 7779d000-777e9000 r-xp 00000000 00:0c 946
/lib/libumsg.so
2020.06.19-16:58:33.43@0: 777ef000-777f6000 r-xp 00000000 00:0c 958
/lib/ld-uClibc-0.9.33.2.so
2020.06.19-16:58:33.43@0:
2020.06.19-16:58:33.43@0: stack: 0x7f8e0000 - 0x7f8df3e0
2020.06.19-16:58:33.43@0: 3c ab 05 08 04 00 fe 08 e0 0f 00 00 14 37 07
08 24 7a 05 08 00 00 00 00 18 f4 8d 7f 04 7a 05 08
2020.06.19-16:58:33.43@0: 08 00 00 00 24 7a 05 08 04 00 00 00 00 00 00
00 70 4a 7a 77 e4 9a 7e 77 38 f4 8d 7f e4 9a 7e 77
2020.06.19-16:58:33.43@0:
2020.06.19-16:58:33.43@0: code: 0x8050dac
2020.06.19-16:58:33.43@0: 8b 43 04 83 e0 fc 85 c0 74 1c 8b 4b 14 39 34
08
This vulnerability was initially found in long-term 6.46.3, and it seems
that the latest version stable 6.48.2 still suffers from this vulnerability.
4. CVE-2020-20237
The sniffer process suffers from a memory corruption vulnerability. By
sending a crafted packet, an authenticated remote user can crash the
sniffer process due to invalid memory access.
Against stable 6.46.5, the poc resulted in the following crash dump.
# cat /rw/logs/backtrace.log
2020.06.19-17:58:43.98@0:
2020.06.19-17:58:43.98@0:
2020.06.19-17:58:43.98@0: /nova/bin/sniffer
2020.06.19-17:58:43.98@0: --- signal=11
--------------------------------------------
2020.06.19-17:58:43.98@0:
2020.06.19-17:58:43.98@0: eip=0x77712055 eflags=0x00010202
2020.06.19-17:58:43.98@0: edi=0x77720f34 esi=0x77721015 ebp=0x7ff96b38
esp=0x7ff96af8
2020.06.19-17:58:43.98@0: eax=0x77721054 ebx=0x7771f000 ecx=0x77721034
edx=0x77721014
2020.06.19-17:58:43.98@0:
2020.06.19-17:58:43.98@0: maps:
2020.06.19-17:58:43.98@0: 08048000-08056000 r-xp 00000000 00:0c 1034
/nova/bin/sniffer
2020.06.19-17:58:43.98@0: 776e9000-7771e000 r-xp 00000000 00:0c 964
/lib/libuClibc-0.9.33.2.so
2020.06.19-17:58:43.98@0: 77722000-7773c000 r-xp 00000000 00:0c 960
/lib/libgcc_s.so.1
2020.06.19-17:58:43.98@0: 7773d000-7774c000 r-xp 00000000 00:0c 944
/lib/libuc++.so
2020.06.19-17:58:43.98@0: 7774d000-77755000 r-xp 00000000 00:0c 950
/lib/libubox.so
2020.06.19-17:58:43.98@0: 77756000-777a2000 r-xp 00000000 00:0c 946
/lib/libumsg.so
2020.06.19-17:58:43.98@0: 777a8000-777af000 r-xp 00000000 00:0c 958
/lib/ld-uClibc-0.9.33.2.so
2020.06.19-17:58:43.98@0:
2020.06.19-17:58:43.98@0: stack: 0x7ff97000 - 0x7ff96af8
2020.06.19-17:58:43.98@0: 00 f0 71 77 00 0f 72 77 30 00 00 00 00 00 00
00 38 b2 05 08 34 0f 72 77 04 00 00 00 00 0f 72 77
2020.06.19-17:58:43.98@0: 20 00 00 00 1b 7b 71 77 e8 f1 71 77 98 00 00
00 01 00 00 00 ec c4 74 77 74 a1 05 08 f8 6b f9 7f
2020.06.19-17:58:43.98@0:
2020.06.19-17:58:43.98@0: code: 0x77712055
2020.06.19-17:58:43.98@0: 89 14 10 eb bc 8b 93 a4 ff ff ff 8b 7d e0 8b
42
Interestingly, the same poc resulted in another different crash
dump(SIGABRT) against stable 6.48.2.
# cat /rw/logs/backtrace.log
2021.05.07-16:02:37.25@0:
2021.05.07-16:02:37.25@0:
2021.05.07-16:02:37.25@0: /nova/bin/sniffer
2021.05.07-16:02:37.25@0: --- signal=6
--------------------------------------------
2021.05.07-16:02:37.25@0:
2021.05.07-16:02:37.25@0: eip=0x776f255b eflags=0x00000246
2021.05.07-16:02:37.25@0: edi=0x0805aca8 esi=0x776fa200 ebp=0x7f97def8
esp=0x7f97def0
2021.05.07-16:02:37.25@0: eax=0x00000000 ebx=0x000000b6 ecx=0x000000b6
edx=0x00000006
2021.05.07-16:02:37.25@0:
2021.05.07-16:02:37.25@0: maps:
2021.05.07-16:02:37.25@0: 08048000-08056000 r-xp 00000000 00:0c 1036
/nova/bin/sniffer
2021.05.07-16:02:37.25@0: 776c4000-776f9000 r-xp 00000000 00:0c 966
/lib/libuClibc-0.9.33.2.so
2021.05.07-16:02:37.25@0: 776fd000-77717000 r-xp 00000000 00:0c 962
/lib/libgcc_s.so.1
2021.05.07-16:02:37.25@0: 77718000-77727000 r-xp 00000000 00:0c 945
/lib/libuc++.so
2021.05.07-16:02:37.25@0: 77728000-77730000 r-xp 00000000 00:0c 951
/lib/libubox.so
2021.05.07-16:02:37.25@0: 77731000-7777d000 r-xp 00000000 00:0c 947
/lib/libumsg.so
2021.05.07-16:02:37.25@0: 77783000-7778a000 r-xp 00000000 00:0c 960
/lib/ld-uClibc-0.9.33.2.so
2021.05.07-16:02:37.25@0:
2021.05.07-16:02:37.25@0: stack: 0x7f97f000 - 0x7f97def0
2021.05.07-16:02:37.25@0: 00 a0 6f 77 00 a0 6f 77 30 df 97 7f 77 e0 6e
77 06 00 00 00 00 a2 6f 77 20 00 00 00 00 00 00 00
2021.05.07-16:02:37.25@0: 26 2b 6f 77 00 a0 6f 77 28 df 97 7f 21 2c 6f
77 e8 a1 6f 77 00 a0 6f 77 00 bf 6f 77 a8 ac 05 08
2021.05.07-16:02:37.25@0:
2021.05.07-16:02:37.25@0: code: 0x776f255b
2021.05.07-16:02:37.25@0: 5b 3d 00 f0 ff ff 76 0e 8b 93 cc ff ff ff f7
d8
This vulnerability was initially found in long-term 6.46.3, and it seems
that the latest stable version 6.48.2 suffers from an assertion failure
vulnerability when running the same poc.
Solution
========
No upgrade firmware available yet
References
==========
[1] https://mikrotik.com/download/changelogs/stable-release-tree
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