Information disclosure in jackson-databind - CVE-2019-12086
Published: August 6, 2019
Vulnerability identifier: #VU19941
CSH Severity: Medium
CVSS v4.0: 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:P/U:Green
CVE-ID: CVE-2019-12086
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FasterXML
Affected software:
jackson-databind
jackson-databind
Detailed vulnerability 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.
How to mitigate CVE-2019-12086
Install updates from vendor's website.
Sources
- http://russiansecurity.expert/2016/04/20/mysql-connect-file-read/
- https://github.com/FasterXML/jackson-databind/issues/2326
- https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.9.9
- https://lists.debian.org/debian-lts-announce/2019/05/msg00030.html
- https://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062