Multiple vulnerabilities in Drupal
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2017-6922 CVE-2017-6920 CVE-2017-6921 |
| CWE-ID | CWE-693 CWE-19 CWE-20 |
| Exploitation vector | Network |
| Public exploit | Vulnerability #1 is being exploited in the wild. |
| Vulnerable software Subscribe |
Drupal Web applications / CMS |
| Vendor | Drupal |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Security restrictions bypass
EUVDB-ID: #VU7179
Risk: Medium
CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C]
CVE-ID: CVE-2017-6922
CWE-ID:
CWE-693 - Protection Mechanism Failure
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass security restrictions on the target system.
The weakness exists due to insufficient file protection. A remote attacker can bypass access restrictions and view private files that have been uploaded by an anonymous user but not permanently attached to content on the site.
Successful exploitation of the vulnerability may result in access bypass.
Note: The vulnerability was being actively exploited for spam purposes.
Update to version 7.56 and 8.3.4.
Vulnerable software versionsDrupal: 7.1 - 8.3.3
External linkshttp://www.drupal.org/SA-CORE-2017-003
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?
Yes. This vulnerability is being exploited in the wild.
2) Arbitrary PHP code execution
EUVDB-ID: #VU7180
Risk: High
CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-6920
CWE-ID:
CWE-19 - Data Handling
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute PHP code on the target system.
The weakness exists due to improper handling of PHP objects by PECL YAML parser during certain operations within Drupal core. A remote attacker can send a specially crafted file and execute PHP code on the vulnerable system.
Update to version 8.3.4.
Vulnerable software versionsDrupal: 8.0 - 8.3.3
External linkshttp://www.drupal.org/SA-CORE-2017-003
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.
3) Security restrictions bypass
EUVDB-ID: #VU7181
Risk: Medium
CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-6921
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass security restrictions on the site.
The weakness exists due to improper validation of some fields by the file REST resource when manipulating files. If the site has the RESTful Web Services (rest) module enabled, the file REST resource is enabled and allows PATCH requests and has, a remote attacker can obtain a user account on the site with permissions to upload files and to modify the file resource.
Successful exploitation of the vulnerability results in access bypass.
Update to version 8.3.4.
Vulnerable software versionsDrupal: 8.0 - 8.3.3
External linkshttp://www.drupal.org/SA-CORE-2017-003
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.
