libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/...

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.

出典: OSV.dev (Open Source Vulnerabilities) OSV

影響パッケージ

Alpine:v3.21 libssh2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-r2"}]}]

Alpine:v3.22 libssh2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-r2"}]}]

Alpine:v3.23 libssh2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-r3"}]}]

Alpine:v3.24 libssh2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-r3"}]}]

Alpine:v3.24 rust

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.96.1-r0"}]}]

参照URL

advisory security.alpinelinux.org