SB2019082811 - Privilege escalation in MikroTik RouterOS

Description

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2019-15055)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to delete arbitrary files.

The vulnerability exists due to insufficient validation of the disk name. A remote authenticated attacker can reset credential storage, access to the management interface as an administrator without authentication and delete arbitrary files.

2) NULL pointer dereference (CVE-ID: N/A)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in console process. A remote authenticated user can send a specially crafted packet and perform a denial of service (DoS) attack.

3) Reachable Assertion (CVE-ID: N/A)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion within the console process. A remote authenticated user can send a specially crafted packet and perform a denial of service attack.

Remediation

Install update from vendor's website.

References

• https://fortiguard.com/zeroday/FG-VD-19-108
• https://mikrotik.com/download/changelogs/testing-release-tree
• https://seclists.org/fulldisclosure/2020/Jan/12
• https://mikrotik.com/download/changelogs/long-term-release-tree