#VU20025 Out-of-bounds read in libmodbus - CVE-2019-14462

Vulnerability identifier: #VU20025

Vulnerability risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-14462

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
libmodbus
Universal components / Libraries / Libraries used by multiple products

Vendor: libmodbus.org

Description

The vulnerability allows a local user to gain access to potentially sensitive information or perform denial of service attack.

The vulnerability exists due to a boundary condition within MODBUS_FC_WRITE_MULTIPLE_COILS in libmodbus. A local user can submit specially crafted input to the affected aplication, trigger out-of-bounds read error and read contents of memory on the system or perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libmodbus: 3.0.0 - 3.1.4

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External links
https://github.com/stephane/libmodbus/commit/5ccdf5ef79d742640355d1132fa9e2abc7fbaefc
https://libmodbus.org/2019/stable-and-development-releases/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.