Medium severity · published Mar 28, 2017
CVE-2016-9464
Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares
4.3
CVSS
1.6%
EPSS
No
On KEV
Description
Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 76% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 9.0.54; 10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-9464
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-9464
Third Party Advisory
http://www.securityfocus.com/bid/97287
Issue Tracking
https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202
Issue Tracking
https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0
Issue Tracking
https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f
Issue Tracking
https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8
Exploit
https://hackerone.com/reports/153905
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