Off-by-one in OSSEC - CVE-2020-8443
Published: January 30, 2020 / Updated: January 6, 2025
Vulnerability identifier: #VU24779
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8443
CWE-ID: CWE-193
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to an off-by-one error in the server component responsible for log analysis during the cleaning of crafted "syslog" messages. A remote authenticated attacker can send a specially crafted message, trigger an off-by-one heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
OSSEC
How to mitigate CVE-2020-8443
Install update from vendor's website.
OSSEC - update to 3.6.0