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CVE-2021-27905— SSRF vulnerability with the Replication handler

Quick assessment

Affected
Apache Software Foundation Apache Solr
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Solr是美国阿帕奇（Apache）基金会的一款基于Lucene（一款全文搜索引擎）的搜索服务器。该产品支持层面搜索、垂直搜索、高亮显示搜索结果等。 Apache Solr 8.8.2之前版本存在代码问题漏洞，攻击者可利用masterUrl参数将索引数据复制到本地内核中。

AI Predicted 7.5 Difficulty: Moderate EPSS 93.05% · P100

Public Exploits 1

Nuclei · 1 CVE-2021-27905.yaml [template]
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I. Basic Information for CVE-2021-27905

Vulnerability Information
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Vulnerability Title
SSRF vulnerability with the Replication handler
Source: CVE Program / CVE List V5
Vulnerability Description
The ReplicationHandler (normally registered at "/replication" under a Solr core) in Apache Solr has a "masterUrl" (also "leaderUrl" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. Prior to this bug getting fixed, it did not. This problem affects essentially all Solr versions prior to it getting fixed in 8.8.2.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Solr 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Solr是美国阿帕奇（Apache）基金会的一款基于Lucene（一款全文搜索引擎）的搜索服务器。该产品支持层面搜索、垂直搜索、高亮显示搜索结果等。 Apache Solr 8.8.2之前版本存在代码问题漏洞，攻击者可利用masterUrl参数将索引数据复制到本地内核中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Solr Apache Solr ~ 8.8.2 -

II. Public POCs for CVE-2021-27905

# POC Description Source Link Shenlong Link
1 Apache Solr SSRF(CVE-2021-27905) https://github.com/Henry4E36/Solr-SSRF POC Details
2 CVE-2021-27905 https://github.com/W2Ning/Solr-SSRF POC Details
3 [CVE-2021-27905] Apache Solr ReplicationHandler Server Side Request Forgery (SSRF) https://github.com/murataydemir/CVE-2021-27905 POC Details
4 POC for LFI related to CVE-2021-27905 https://github.com/pdelteil/CVE-2021-27905.POC POC Details
5 Apache Solr versions 8.8.1 and prior contain a server-side request forgery vulnerability. The ReplicationHandler (normally registered at "/replication" under a Solr core) in Apache Solr has a "masterUrl" (also "leaderUrl" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-27905.yaml POC Details
6 None https://github.com/Threekiii/Awesome-POC/blob/master/%E4%B8%AD%E9%97%B4%E4%BB%B6%E6%BC%8F%E6%B4%9E/Apache%20Solr%20Replication%20handler%20SSRF%20CVE-2021-27905.md POC Details
7 Apache Solr < 8.8.2 Server Side Request Forgery https://github.com/RIZZZIOM/CVE-2021-27905 POC Details
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III. Intelligence Information for CVE-2021-27905

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Vendor Advisories for CVE-2021-27905 (1)

Mailing List Discussions for CVE-2021-27905 (9)

Same Patch Batch · Apache Software Foundation · 2021-04-13 · 4 CVEs total

CVE-2021-29262 Misapplied Zookeeper ACLs can result in leakage of configured authentication and authoriza
CVE-2021-29943 Apache Solr Unprivileged users may be able to perform unauthorized read/write to collectio
CVE-2021-29425 Possible limited path traversal vulnerabily in Apache Commons IO

IV. Related Vulnerabilities

Same product: Apache Solr
Same vendor: Apache Software Foundation
Same weakness: CWE-918

V. Comments for CVE-2021-27905

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