Stack-based buffer overflow in libslax - CVE-2021-39531
Published: April 12, 2024
Vulnerability identifier: #VU88500
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-39531
CWE-ID: CWE-121
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 a boundary error within the slaxLexer() function in slaxlexer.c. A remote unauthenticated attacker can pass specially crafted input to the application, trigger a stack-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
libslax
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2021-39531
Install updates from vendor's website.
libslax - update to 0.22.1
Junos OS Evolved - addressed in versions 22.3R3-S2-EVO, 22.4R2-EVO, 22.4R3-EVO, 23.2R1-EVO
Junos OS Evolved - addressed in versions 22.3R3-S2-EVO, 22.4R2-EVO, 22.4R3-EVO, 23.2R1-EVO