Medium severity · published Apr 5, 2017
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
6.4
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
through 9.0.54; 10.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-0883
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-0883
Third Party Advisory
https://hackerone.com/reports/169680
Patch
https://nextcloud.com/security/advisory/?id=nc-sa-2017-001
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