SSRF vulnerability with the Replication handler
CVE-2021-27905

9.8CRITICAL

Key Information:

Vendor
Apache
Status
Apache Solr
Vendor
CVE Published:
13 April 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 94%

Summary

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.

Affected Version(s)

Apache Solr Apache Solr < 8.8.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

Solr-SSRF
Created by Henry4E36

CVE-2021-27905
Created by murataydemir

CVE-2021-27905.POC
Created by pdelteil

References

https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453...
x_refsource_MISC
https://security.netapp.com/advisory/ntap-20210611-0009/
x_refsource_CONFIRM
https://lists.apache.org/thread.html/r95df34bb158375948da...
mailing-listx_refsource_MLIST

EPSS Score

94% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre Database4 Proof of Concept(s)

Credit

Reported by Caolinhong(Skay) from QI-ANXIN Cert (QI-ANXIN Technology Group Inc.)
.