Heap-based buffer overflow in libslax - CVE-2021-39534
Published: April 12, 2024
Vulnerability identifier: #VU88503
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-2021-39534
CWE-ID: CWE-122
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 slaxIsCommentStart() function in slaxlexer.c. A remote attacker can pass specially crafted data to the application, trigger a 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
libslax
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2021-39534
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