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CVE-2019-3863

Quick assessment

Affected
The libssh2 Project libssh2
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.

libssh2是一款实现SSH2协议的客户端C库，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh2中的userauth.c文件的‘userauth_keyboard_interactive()’函数存在缓冲区错误漏洞。远程攻击者可利用该漏洞执行代码。

AI Predicted 9.8 Difficulty: Easy EPSS 3.44% · P88

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2019-3863

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
libssh2 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh2是一款实现SSH2协议的客户端C库，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh2中的userauth.c文件的‘userauth_keyboard_interactive()’函数存在缓冲区错误漏洞。远程攻击者可利用该漏洞执行代码。
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
The libssh2 Project libssh2 1.8.1 -

II. Public POCs for CVE-2019-3863

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III. Intelligence Information for CVE-2019-3863

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Vendor Advisories for CVE-2019-3863 (9)

Mailing List Discussions for CVE-2019-3863 (5)

Other References for CVE-2019-3863 (1)

Same Patch Batch · The libssh2 Project · 2019-03-25 · 5 CVEs total

CVE-2019-3856 libssh2 输入验证错误漏洞
CVE-2019-3857 libssh2 输入验证错误漏洞
CVE-2019-3860 libssh2 缓冲区错误漏洞
CVE-2019-3861 libssh2 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: libssh2
Same vendor: The libssh2 Project
Same weakness: CWE-190

V. Comments for CVE-2019-3863

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