// For flags

CVE-2021-27905

SSRF vulnerability with the Replication handler

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

2
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

La función ReplicationHandler (normalmente registrado en "/replication" bajo un core Solr) en Apache Solr presenta un parámetro "masterUrl" (también se conoce como "leaderUrl") que es usada para designar otro ReplicationHandler en otro core Solr para replicar datos de índice en el core local . Para impedir una vulnerabilidad de SSRF, Solr debería comparar estos parámetros con una configuración similar que usa para el parámetro "shards". Antes de que fuera corregido este bug, no era así. Este problema afecta esencialmente a todas las versiones de Solr anteriores a que fuese corregido en la versión 8.8.2

*Credits: Reported by Caolinhong(Skay) from QI-ANXIN Cert (QI-ANXIN Technology Group Inc.)
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-02 CVE Reserved
  • 2021-04-13 CVE Published
  • 2021-08-10 First Exploit
  • 2024-08-03 CVE Updated
  • 2024-09-16 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-918: Server-Side Request Forgery (SSRF)
CAPEC
References (14)
URL Tag Source
https://lists.apache.org/thread.html/r140128dc6bb4f4e0b6a39e962c7ca25a8cbc8e48ed766176c931fccc%40%3Cusers.solr.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r3da74965aba2b5f5744b7289ad447306eeb2940c872801819faa9314%40%3Cusers.solr.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r6ccec7fc54d82591b23c143f1f6a6e38f6e03e75db70870e4cb14a1a%40%3Ccommits.ofbiz.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r720a4a0497fc90bad5feec8aa18b777912ee15c7eeb5f882adbf523e%40%3Ccommits.ofbiz.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r78a3a4f1138a1608b0c6d4a2ee7647848c1a20b0d5c652cd9b02c25a%40%3Ccommits.ofbiz.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r8f1152a43c36d878bbeb5a92f261e9efaf3af313b033d7acfccea59d%40%3Cnotifications.ofbiz.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r95df34bb158375948da82b4dfe9a1b5d528572d586584162f8f5aeef%40%3Cusers.solr.apache.org%3E Mailing List
https://lists.apache.org/thread.html/rae9ccaecce9859f709ed1458545d90a4c07163070dc98b5e9e59057f%40%3Cnotifications.ofbiz.apache.org%3E Mailing List
https://lists.apache.org/thread.html/rd232d77c57a8ce172359ab098df9512d8b37373ab87c444be911b430%40%3Cnotifications.ofbiz.apache.org%3E Mailing List
https://lists.apache.org/thread.html/re9d64bb8e5dfefddcbf255adb4559e13a0df5b818da1b9b51329723f%40%3Cnotifications.ofbiz.apache.org%3E Mailing List
https://security.netapp.com/advisory/ntap-20210611-0009 Third Party Advisory
URL Date SRC
https://github.com/murataydemir/CVE-2021-27905 2021-08-10
https://github.com/pdelteil/CVE-2021-27905.POC 2022-11-17
URL Date SRC
URL Date SRC
https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb5559517145425074a42eb326b10%40%3Cannounce.apache.org%3E 2023-11-07
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apache
Search vendor "Apache"
 Solr
Search vendor "Apache" for product "Solr"
 < 8.8.2
Search vendor "Apache" for product "Solr" and version " < 8.8.2"
-
Affected