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CVE-2019-3857

Quick assessment

Affected
The libssh2 Project libssh2
Exploitation
High exploitation probability; assess promptly
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中存在输入验证错误漏洞，该漏洞源于_libssh2_packet_add()函数没有正确地检查SSH_MSG_CHANNEL_REQUEST消息的namelen值。远程攻击者可利用该漏洞在客户端系统上执行代码。

AI Predicted 9.8 Difficulty: Easy EPSS 6.13% · P93

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2019-3857

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
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 输入验证错误漏洞
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中存在输入验证错误漏洞，该漏洞源于_libssh2_packet_add()函数没有正确地检查SSH_MSG_CHANNEL_REQUEST消息的namelen值。远程攻击者可利用该漏洞在客户端系统上执行代码。
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-2019-3857

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III. Intelligence Information for CVE-2019-3857

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Vendor Advisories for CVE-2019-3857 (9)

Mailing List Discussions for CVE-2019-3857 (5)

Other References for CVE-2019-3857 (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-2019-3860 libssh2 缓冲区错误漏洞
CVE-2019-3861 libssh2 缓冲区错误漏洞
CVE-2019-3863 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-2019-3857

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