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CVE-2021-3618

Quick assessment

Affected
n/a ALPACA
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.

F5 Nginx是美国F5公司的一款轻量级Web服务器/反向代理服务器及电子邮件（IMAP/POP3）代理服务器，在BSD-like协议下发行。 F5 Nginx存在信任管理问题漏洞，该漏洞源于存在 ALPACA（应用层协议内容混淆）攻击，这会破坏TLS的身份验证，并且可能会发生跨协议攻击。

AI Predicted 6.5 Difficulty: Moderate EPSS 2.04% · P80

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2021-3618

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim's traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
F5 Nginx 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 Nginx是美国F5公司的一款轻量级Web服务器/反向代理服务器及电子邮件（IMAP/POP3）代理服务器，在BSD-like协议下发行。 F5 Nginx存在信任管理问题漏洞，该漏洞源于存在 ALPACA（应用层协议内容混淆）攻击，这会破坏TLS的身份验证，并且可能会发生跨协议攻击。
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
- ALPACA vsftpd 3.0.4, nginx 1.21.0, sendmail 8.17 -

II. Public POCs for CVE-2021-3618

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III. Intelligence Information for CVE-2021-3618

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Vendor Advisories for CVE-2021-3618 (1)

Mailing List Discussions for CVE-2021-3618 (1)

Other References for CVE-2021-3618 (1)

Same Patch Batch · n/a · 2022-03-23 · 65 CVEs total

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CVE-2022-22951 VMware Carbon Black App Control 操作系统命令注入漏洞
CVE-2021-4150 Linux kernel 资源管理错误漏洞
CVE-2021-4149 Linux kernel 竞争条件问题漏洞

Showing top 20 of 65 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-295

V. Comments for CVE-2021-3618

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