Vulnerability Monitor

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CVE-2016-9464

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.

Published

2017-03-28T02:59:00.997

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 4.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-285
Type: Primary
CWE-285

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nextcloud	nextcloud_server	< 9.0.54	Yes
Application	nextcloud	nextcloud_server	10.0	Yes

References

http://www.securityfocus.com/bid/97287 Third Party Advisory, VDB Entry ([email protected])
https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://hackerone.com/reports/153905 Exploit, Third Party Advisory ([email protected])
https://nextcloud.com/security/advisory/?id=nc-sa-2016-007 Patch, Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/97287 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://hackerone.com/reports/153905 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://nextcloud.com/security/advisory/?id=nc-sa-2016-007 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)