On February 19, National Vulnerability Database (NVD) disclosed a remote code execution vulnerability (CVE-2020-8840) that resulted from JNDI injection in jackson-databind and assigned a CVSS score of 9.8. Affected versions of jackson-databind lack certain xbean-reflect/JNDI blocking, as demonstrated by org.apache.xbean.propertyeditor.JndiConverter. An attacker could exploit this vulnerability to cause remote code execution via JNDI injection. Currently, the vendor has released new versions to fix this vulnerability. Affected users are advised to update their installation to the latest versions as soon as possible.
For details of this vulnerability, visit the following link:
Scope of Impact
- 0.0 <= FasterXML jackson-databind <= 126.96.36.199
- FasterXML jackson-databind = 188.8.131.52
- FasterXML jackson-databind = 184.108.40.206 (to be released)
Developers are advised to check whether the jackson-databind component is used in applications, and if so, to further check its version number. The following uses the Maven project as an example to show how to check the use of jackson-databind.
Check whether jackson-databind is included in pom.xml and, if so, check the current version.
If the current version is within the affected scope, the application is potentially at risk.
Currently, this vulnerability has been fixed in new versions. Affected users are advised to upgrade to the new versions as soon as possible. If no patch is not available for certain versions currently, related users should check the official website from time to time to download the update immediately after it is released:
Developers can upgrade and compile jackson-databind by configuring Maven as follows:
|<!– https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind –>
Protection with Security Products
NSFOCUS Web Application Firewall (WAF)’s legacy protection rule (27004899) can protect against this vulnerability. Users should update protection rules on the device as soon as possible for vulnerability protection.
This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.
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