Vulnerability identifier: #VU88500

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39531

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

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

Vendor: Juniper Networks, Inc.

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libslax: 0.15.0 - 0.22.0

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External links
http://github.com/Juniper/libslax/issues/53

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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