Multiple vulnerabilities in Apache Solr
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-27905 CVE-2021-29943 CVE-2021-29262 |
| CWE-ID | CWE-918 CWE-285 CWE-284 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
Apache Solr Client/Desktop applications / Other client software |
| Vendor | Apache Foundation |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
Updated: 13.04.2021
Added vulnerabilities #2-3.
1) Server-Side Request Forgery (SSRF)
EUVDB-ID: #VU52060
Risk: Medium
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2021-27905
CWE-ID:
CWE-918 - Server-Side Request Forgery (SSRF)
Exploit availability: Yes
DescriptionThe disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input passed via the "masterUrl" or "leaderUrl" parameters to "/replication" URL. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsApache Solr: 8.0.0 - 8.8.1
External linkshttp://seclists.org/oss-sec/2021/q2/19
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
2) Improper Authorization
EUVDB-ID: #VU52061
Risk: Medium
CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-29943
CWE-ID:
CWE-285 - Improper Authorization
Exploit availability: No
DescriptionThe vulnerability allows a remote user to gain access to otherwise restricted functionality.
The vulnerability exists in ConfigurableInternodeAuthHadoopPlugin implementation. Apache Solr forwards distributed requests using server credentials instead of original client credentials. A remote user can abuse such behavior to gain access to otherwise restricted functionality.
Install updates from vendor's website.
Vulnerable software versionsApache Solr: 8.0.0 - 8.8.1
External linkshttp://seclists.org/oss-sec/2021/q2/17
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Improper access control
EUVDB-ID: #VU52062
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-29262
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions. When starting Apache Solr, configured with the SaslZkACLProvider or VMParamsAllAndReadonlyDigestZkACLProvider and no existing security.json znode, if the optional read-only user is configured then Solr would not treat that node as a sensitive path and would allow it to be readable.
MitigationInstall updates from vendor's website.
Vulnerable software versionsApache Solr: 8.0.0 - 8.8.1
External linkshttp://seclists.org/oss-sec/2021/q2/18
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
