Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-45150— Inviting excessive long email addresses to a calendar event makes the Nextcloud server unresponsive

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 calendar 1.0.0版本及之后版本存在资源管理错误漏洞，该漏洞源于缺少先决条件检查，即使用户提供兆字节的数据，服务器也会尝试将任意长度的字符串验证为电子邮件地址，最终导致服务器繁忙且无响应。

CVSS 4.3 · Medium EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-45150

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Inviting excessive long email addresses to a calendar event makes the Nextcloud server unresponsive
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings of any length as email addresses even when megabytes of data were provided, eventually making the server busy and unresponsive. It is recommended that the Nextcloud Calendar app is upgraded to 4.4.4. The only workaround for users unable to upgrade is to disable the calendar app.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 资源管理错误漏洞
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 calendar 1.0.0版本及之后版本存在资源管理错误漏洞，该漏洞源于缺少先决条件检查，即使用户提供兆字节的数据，服务器也会尝试将任意长度的字符串验证为电子邮件地址，最终导致服务器繁忙且无响应。
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 >= 1.0.0, < 4.4.4 -

II. Public POCs for CVE-2023-45150

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2023-45150

请登录查看更多情报信息。

Patches & Fixes for CVE-2023-45150 (1)

Vendor Advisories for CVE-2023-45150 (1)

Other References for CVE-2023-45150 (1)

Same Patch Batch · nextcloud · 2023-10-16 · 5 CVEs total

CVE-2023-45151 6.5 MEDIUM OAuth2 client_secret stored in plain text in the Nextcloud database
CVE-2023-45149 4.3 MEDIUM Password of talk conversations can be bruteforced in Nextcloud
CVE-2023-45148 4.3 MEDIUM Rate limiter not working reliable when Memcached is installed in Nextcloud
CVE-2023-45660 4.3 MEDIUM Require strict cookies for image proxy requests in Nextcloud Mail

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-400

V. Comments for CVE-2023-45150

No comments yet

Leave a comment