Medium severity · published Jun 23, 2023
CVE-2023-35173
End-to-End encrypted file-drops can be made inaccessible
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
Nextcloud End-to-end encryption app provides all the necessary APIs to implement End-to-End encryption on the client side. By providing an invalid meta data file, an attacker can make previously dropped files inaccessible. It is recommended that the Nextcloud End-to-end encryption app is upgraded to version 1.12.4 that contains the fix.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
>= 1.12.0, < 1.12.4 · source: vendor
EE
End-to-end Encryption · Nextcloud
1.12.0 before 1.12.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-35173
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-35173
Patch
https://github.com/nextcloud/end_to_end_encryption/pull/435
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x7c7-v5r3-mg37
Third Party Advisory
https://hackerone.com/reports/1914115
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