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CVE-2021-36367

Status Candidate

Overview

PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).

Related Files

Debian Security Advisory 5588-1
Posted Dec 26, 2023
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5588-1 - Fabian Baeumer, Marcus Brinkmann and Joerg Schwenk discovered that the SSH protocol is prone to a prefix truncation attack, known as the "Terrapin attack". This attack allows a MITM attacker to effect a limited break of the integrity of the early encrypted SSH transport protocol by sending extra messages prior to the commencement of encryption, and deleting an equal number of consecutive messages immediately after encryption starts.

tags | advisory, protocol
systems | linux, debian
advisories | CVE-2021-36367, CVE-2023-48795
SHA-256 | 7af4170ad4031fd3d2a9ee78c01336ac9376c0590df4e88dd4e5550f0258ed24
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