Vulnerability identifier: #VU19941

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-12086

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
jackson-databind
Universal components / Libraries / Libraries used by multiple products

Vendor: FasterXML

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a polymorphic typing issue when Default Typing is enabled for an externally exposed JSON endpoint and the service has the mysql-connector-java jar in the classpath. A remote attacker can send a specially crafted JSON message and read arbitrary local files on the server due to the missing "com.mysql.cj.jdbc.admin.MiniAdmin" validation.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

jackson-databind: 2.9.0 - 2.9.8, 2.8.0 - 2.8.11.4, 2.7.0 - 2.7.9.6, 2.6.0 - 2.6.8, 2.5.0 - 2.5.5, 2.4.0 - 2.4.6.1, 2.3.0 - 2.3.5, 2.1.0 - 2.1.4, 2.0.0 - 2.0.4

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External links
http://russiansecurity.expert/2016/04/20/mysql-connect-file-read/
http://github.com/FasterXML/jackson-databind/issues/2326
http://github.com/FasterXML/jackson/wiki/Jackson-Release-2.9.9
http://lists.debian.org/debian-lts-announce/2019/05/msg00030.html
http://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062

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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. However, proof of concept for this vulnerability is available.