#VU57375 Path traversal in Jira Software - CVE-2021-26086

Vulnerability identifier: #VU57375

Vulnerability risk: Medium

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2021-26086

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Jira Software
Client/Desktop applications / Other client software

Vendor: Atlassian

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 /WEB-INF/web.xml endpoint. A remote 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

Jira Software: 8.0.0-m0025 - 8.0.4, 8.1.0 - 8.16.0, 8.2.0 - 8.2.6, 8.3.0 - 8.3.5, 8.4.0 - 8.4.3, 8.5.0 - 8.5.13, 8.6.0 - 8.6.1, 8.7.0 - 8.7.1, 8.8.0 - 8.8.1, 8.9.0 - 8.9.1

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External links
https://jira.atlassian.com/browse/JRASERVER-72695
https://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html

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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?

Yes. This vulnerability is being exploited in the wild.