Vulnerability Description
On October 30, @_S00pY disclosed the exploitation of Apache Solr Remote Code Execution Vulnerability, which allows attackers to implement remote code execution via velocity templates. After testing, the vulnerability can be successfully triggered, and no official security patch has been released.
This vulnerability needs to be triggered in two steps. First, the attacker needs to modify the “params.Resource.Loader.Enabled” configuration item to True through the config API, and then complete the vulnerability trigger by sending a malicious velocity template.
Some POC codes are as follows:
After successful utilization, arbitrary commands can be executed on the server.
Scope of Impact
Affected Versions
- Apache Solr <= 8.2.0 (versions with config API may be affected by this vulnerability)
Vulnerability Detection
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Manual Test
If any of the following conditions are met, the current system may be affected by this vulnerability.
- Access http:/ /hostname /Solr/nstance name /config and find that the config API is open.
- A configfollay.json file exists in the instance configuration directory, under which the configuration item “params.Resource.Loader.Enabled”:”true” can be found. By default, there is no configfollay.json file.
- In the global configuration file solrconfig.xml, the configuration item “params.resource.loader.enabled” is “true”.
Vulnerability Mitigation
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Product Protection
Users deployed with NIPS can protect against this vulnerability by using protection rule 23982.
- Workaround
- Users can disable access to / Solr / instance name / config by access control.
- If ” params.resource.loader.enabled:”true” exists in the configloverlay.json configuration file, change “true” to “false”.
- If the following configuration <bool name=”params.resource.loader.enabled”>true</bool> exists in the velocityresponsewriter in the solrconfig.xml configuration file, modify it to “false”.
- Add security authentication. For detailed configuration methods, please refer to the document released by Apache:
http://lucene.apache.org/solr/guide/8_2/basic-authentication-plugin.html#basic-authentication-plugin
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.
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