Integer underflow in VxWorks - CVE-2019-12255
Published: July 31, 2019 / Updated: June 17, 2021
Vulnerability identifier: #VU19580
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-12255
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer underflow when processing TCP packets with URG-flag set. A remote attacker can send a specially crafted TCP request to the affected system, trigger integer underflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
VxWorks
SIPROTEC 4 7SJ66
PowerConnect Series
SIPROTEC 4 7SJ66
PowerConnect Series
How to mitigate CVE-2019-12255
Install updates from vendor's website.
The vulnerability is fixed for VxWorks 6.9 (version 6.9.4)
SIPROTEC 4 7SJ66 - update to 4.41
PowerConnect Series - update to 5.1.16.1
PowerConnect Series - update to 5.1.16.1