#VU52320 Path traversal in Juniper Junos OS - CVE-2021-0231

Vulnerability identifier: #VU52320

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-0231

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the Juniper Networks SRX and vSRX Series. A remote authenticated attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.3R1-S1 - 19.3, 19.4R1-S1 - 19.4, 20.1R1-S1 - 20.1, 20.2R1-S1 - 20.2

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External links
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11126&cat=SIRT_1&actp=LIST

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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