XXE-attack in Atlassian Universal Plugin Manager

1) XML External Entity injection

EUVDB-ID: #VU17112

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-20233

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

Description

The vulnerability allows a remote attacker with system administrator privileges to conduct XXE-attack.

The vulnerability exists due to improper handling of XML External Entities (XXEs) when parsing of atlassian plugin xml files in an uploaded JAR. A remote attacker can submit a specially crafted input to read files, make network requests and perform a denial of service attack.

Mitigation

The vulnerability has been fixed in the versions 2.22.14, 3.0.0.

Vulnerable software versions

Universal Plugin Manager: 2.22.0 - 2.22.12

External links

http://ecosystem.atlassian.net/browse/UPM-5964

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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