Overview
Recently, two remote code execution vulnerabilities (CVE-2020-9547 and CVE-2020-9548) were fixed in jackson-databind. By using two components (ibatis-sqlmap and anteros-core) to bypass the blacklist restriction, attackers could exploit these vulnerabilities to cause remote code execution on the victim’s machine.
In addition, Fastjson, when using ibatis-sqlmap and anteros-core components and enabling the AutoType function (this function is disabled by default), is also vulnerable to the preceding vulnerabilities.
Reference link:
https://github.com/FasterXML/jackson-databind/issues/2634
Affected Versions:
Jackson-databind 2.x <= 2.9.10.4
Unaffected Versions:
Jackson-databind > 2.9.10.4
Solution
Jackson-databind has released a new version to fix the preceding vulnerabilities. Affected users are advised to upgrade as soon as possible.
https://github.com/FasterXML/jackson-databind
In addition, Fastjson users can disable the AutoType function for risk aversion. Also, they are advised to upgrade the JDK to the latest version.
Users can disable the AutoType function in either of the following ways:
Method 1: 1. Find the following code in the source code and delete it: ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
Method 2: When enabling Fastjson on a Java virtual machine, remember not to add the following parameter: -Dfastjson.parser.autoTypeSupport=true:
Statement
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.
About NSFOCUS
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