CVE-2020-1730

A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR or DES ciphers if enabled ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The bigges...

CVE-2020-1730

The CVE-2020-1730 vulnerability affects libssh versions before 0.8.9 and before 0.9.4, caused by how AES-CTR (or DES, if enabled) ciphers are handled. If a connection isn’t fully initialized, cleaning up these ciphers on close can crash the server or client, impacting availability. Upgrading to l...

CVE-2020-1730

A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR or DES ciphers if enabled ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The bigges...

OPENSUSE-SU-2020:0510-1 Security update for libssh

This update for libssh fixes the following issues: - CVE-2020-1730: Fixed a possible denial of service when using AES-CTR bsc1168699. This update was imported from the SUSE:SLE-15-SP1:Update update project...

Security update for libssh (moderate)

openSUSE Security Update: Security update for libssh Announcement ID: openSUSE-SU-2020:0510-1 Rating: moderate References: 1168699 Cross-References: CVE-2020-1730 Affected Products: openSUSE Leap 15.1 An update that fixes one vulnerability is now available. Description: This update for libssh fix...

Man-in-the-Middle (MitM)

openssh is vulnerable to man-in-the-middle attack. A flaw was found in the SSH protocol. An attacker able to perform a man-in-the-middle attack may be able to obtain a portion of plain text from an arbitrary ciphertext block when a CBC mode cipher was used to encrypt SSH communication. This updat...

SUSE SLES12 Security Update : libssh (SUSE-SU-2020:0968-1)

This update for libssh fixes the following issues : CVE-2020-1730: Fixed a possible denial of service when using AES-CTR bsc1168699. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically...

libssh: Denial of service

Background libssh is a multiplatform C library implementing the SSHv2 protocol on client and server side. Description It was discovered that libssh could crash when AES-CTR ciphers are used. Impact A remote attacker running a malicious client or server could possibly crash the counterpart...

Ubuntu 18.04 LTS : libssh vulnerability (USN-4327-1)

The remote Ubuntu 18.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4327-1 advisory. Yasheng Yang discovered that libssh incorrectly handled AES-CTR ciphers. A remote attacker could possibly use this issue to cause libssh to crash, resulting in a...

Ubuntu: Security Advisory (USN-4327-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2020 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

USN-4327-1: libssh vulnerability

Yasheng Yang discovered that libssh incorrectly handled AES-CTR ciphers. A remote attacker could possibly use this issue to cause libssh to crash, resulting in a denial of service...

CVE-2020-1730

A flaw was found in the way libssh handled AES-CTR or DES ciphers if enabled ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system...

SUSE-SU-2020:0968-1 Security update for libssh

This update for libssh fixes the following issues: - CVE-2020-1730: Fixed a possible denial of service when using AES-CTR bsc1168699...

SUSE-SU-2020:0967-1 Security update for libssh

This update for libssh fixes the following issues: - CVE-2020-1730: Fixed a possible denial of service when using AES-CTR bsc1168699...

CVE-2020-1730

A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR or DES ciphers if enabled ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The bigges...

[ASA-202004-11] libssh: denial of service

Arch Linux Security Advisory ASA-202004-11 ========================================== Severity: Medium Date : 2020-04-09 CVE-ID : CVE-2020-1730 Package : libssh Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1130 Summary ======= The package libssh before version...

Protect

FortiGate models which do not contain and embedded TRNG may suffer from insufficient entropy "seed" in the CTR DRBG random data software generator, in their default configuration...

Client/server denial of service when handling AES-CTR ciphers

The libssh team reports originally reported by Yasheng Yang from Google: A malicious client or server could crash the counterpart implemented with libssh AES-CTR ciphers are used and don't get fully initialized. It will crash when it tries to cleanup the AES-CTR ciphers when closing the connectio...

Nextcloud: Improper confidentiality protection of server-side encryption keys

This vulnerability is related to the Improper integrity protection of server-side encryption keys vulnerability but leverages a different attack vector. While the previous attack broke the confidentiality of encrypted files because the public keys are not integrity-protected, this new attack brea...

Nextcloud: Downgrade encryption scheme and break integrity through known-plaintext attack

The idea behind the Server Side Encryption is that you can move your encrypted files to an external party without that external party being able to to read or modify those files. Some time ago, Nextcloud switched from unauthenticated CFB cipher block mode to authenticated CTR cipher block mode in...