Vulnerability Monitor

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CVE-2017-0883

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue. A permission related issue within the OCS sharing API allowed an authenticated adversary to reshare shared files with an increasing permission set. This may allow an attacker to edit files in a share despite having only a 'read' permission set. Note that this only affects folders and files that the adversary has at least read-only permissions for.

Published

2017-04-05T20:59:00.197

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 6.4 (MEDIUM)

CVSSv2 Vector

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

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

Exploitability Score

8.0

Impact Score

4.9

Weaknesses

Type: Secondary
CWE-275
Type: Primary
CWE-732

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nextcloud	nextcloud_server	≤ 9.0.54	Yes
Application	nextcloud	nextcloud_server	10.0.2	Yes

References

https://hackerone.com/reports/169680 Third Party Advisory ([email protected])
https://nextcloud.com/security/advisory/?id=nc-sa-2017-001 Patch, Vendor Advisory ([email protected])
https://hackerone.com/reports/169680 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://nextcloud.com/security/advisory/?id=nc-sa-2017-001 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)