CVE-2023-28997

Public Exploit
Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files

Description

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

Category

6.7
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 1.07% Top 25%
Vendor Advisory github.com
Affected: nextcloud security-advisories
Published at:
Updated at:

References

Link Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc vendor advisory
https://github.com/nextcloud/desktop/pull/5324 patch
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf third party advisory exploit technical description

Frequently Asked Questions

What is the severity of CVE-2023-28997?
CVE-2023-28997 has been scored as a medium severity vulnerability.
How to fix CVE-2023-28997?
To fix CVE-2023-28997, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-28997 being actively exploited in the wild?
It is possible that CVE-2023-28997 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-28997?
CVE-2023-28997 affects nextcloud security-advisories.
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