Vulnerability in Nextcloud Server
CVE-2023-28835
Nextcloud server is an open source home cloud implementation. In affected versions the generated fallback password when creating a share was using a weak complexity random number generator, so when the sharer did not change it the password could be guessable to an attacker willing to brute force it. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. This issue only affects users who do not have a password policy enabled, so enabling a password policy is an effective mitigation for users unable to upgrade.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Nextcloud Server
- Nextcloud Security-Advisories — versions < 24.0.10, >= 25.0.0, < 25.0.4
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9 (Vendor Advisory)
- github.com/nextcloud/server/pull/36093 (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2023-28835?
- CVE-2023-28835 is a low-severity vulnerability in Nextcloud Server, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 3.5/10. Published 2023-03-30.
- How severe is CVE-2023-28835?
- Low severity. CVSS v3 base score is 3.5 out of 10.