漏洞信息
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Vulnerability Title
libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation
Vulnerability Description
libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit the underflow in the expression computing blocksize minus aadlen minus authentication tag length to trigger an out-of-bounds read and a memcpy call with a near-SIZE_MAX length argument, causing immediate process crash before any authentication occurs.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
整数下溢(超界折返)
Vulnerability Title
libssh2 缓冲区错误漏洞
Vulnerability Description
libssh2是libssh2团队开源的一款实现SSH2协议的客户端C库。 libssh2 1.11.1及之前版本存在安全漏洞,该漏洞源于ssh2_cipher_crypt函数中存在整数下溢问题,攻击者可利用该漏洞通过协商AES-GCM密码触发越界读取和memcpy调用,导致进程崩溃。
CVSS Information
N/A
Vulnerability Type
N/A