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CVE-2023-28835— Insecure randomness for default password in nextcloud

Quick assessment

Affected
nextcloud security-advisories
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 存在安全特征问题漏洞，该漏洞源于创建共享时生成的后备密码复杂性较弱，导致攻击者可以猜解密码并进行暴力破解。

CVSS 3.5 · Low EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1110.004 · Credential Stuffing
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I. Basic Information for CVE-2023-28835

Vulnerability Information
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Vulnerability Title
Insecure randomness for default password in nextcloud
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用具有密码学弱点缺陷的PRNG
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 存在安全特征问题漏洞，该漏洞源于创建共享时生成的后备密码复杂性较弱，导致攻击者可以猜解密码并进行暴力破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nextcloud security-advisories < 24.0.10 -

II. Public POCs for CVE-2023-28835

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III. Intelligence Information for CVE-2023-28835

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Patches & Fixes for CVE-2023-28835 (1)

Vendor Advisories for CVE-2023-28835 (1)

Same Patch Batch · nextcloud · 2023-03-30 · 7 CVEs total

CVE-2023-26482 9.1 CRITICAL Scope of workflow operations is not validated in nextcloud server
CVE-2023-28644 5.7 MEDIUM Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server
CVE-2023-28643 5.5 MEDIUM Potential share collision for recipients when caching is enabled in nextcloud server
CVE-2023-28646 4.4 MEDIUM App lockout in nextcloud Android app can be bypassed via thirdparty apps
CVE-2023-28647 4.4 MEDIUM App pin of the iOS app can be bypassed in Nextcloud iOS
CVE-2023-28833 2.4 LOW Unrestricted filenames for logo or favicon as admin in the theming settings in nextcloud s

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-338

V. Comments for CVE-2023-28835

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