The SSH transport protocol with certain OpenSSH extensions found in OpenSSH before 9.6 and other products allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message) and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP) implemented by these extensions mishandles the handshake phase and mishandles use of sequence numbers. For example there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in [email protected] and (if CBC is used) the [email protected] MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT Dropbear through 2022.83 Ssh before 5.1.1 in Erlang/OTP PuTTY before 0.80 AsyncSSH before 2.14.2 golang.org/x/crypto before 0.17.0 libssh before 0.10.6 libssh2

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FreeBSD : gitea -- Prefix Truncation Attack against ChaCha20-Poly1305 and Encrypt-then-MAC aka Terrapin (b2765c89-a052-11ee-bed2-596753f1a87c)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the b2765c89-a052-11ee-bed2-596753f1a87c advisory. - The Gitea team reports: Update golang.org/x/crypto b2765c89-a052-11ee-bed2-596753f1a87c Note that...

gitea -- Prefix Truncation Attack against ChaCha20-Poly1305 and Encrypt-then-MAC aka Terrapin

The Gitea team reports: Update golang.org/x/crypto...

GHSA-45X7-PX36-X8W8 Prefix Truncation Attack against ChaCha20-Poly1305 and Encrypt-then-MAC aka Terrapin

Summary Terrapin is a prefix truncation attack targeting the SSH protocol. More precisely, Terrapin breaks the integrity of SSH's secure channel. By carefully adjusting the sequence numbers during the handshake, an attacker can remove an arbitrary amount of messages sent by the client or server a...

Prefix Truncation Attack against ChaCha20-Poly1305 and Encrypt-then-MAC aka Terrapin

Summary Terrapin is a prefix truncation attack targeting the SSH protocol. More precisely, Terrapin breaks the integrity of SSH's secure channel. By carefully adjusting the sequence numbers during the handshake, an attacker can remove an arbitrary amount of messages sent by the client or server a...

AsyncSSH vulnerable to Prefix Truncation Attack (a.k.a. Terrapin Attack) against ChaCha20-Poly1305 and Encrypt-then-MAC

Summary AsyncSSH v2.14.1 and earlier is vulnerable to a novel prefix truncation attack a.k.a. Terrapin attack, which allows a man-in-the-middle attacker to strip an arbitrary number of messages right after the initial key exchange, breaking SSH extension negotiation RFC8308 in the process and thu...

GHSA-HFMC-7525-MJ55 AsyncSSH vulnerable to Prefix Truncation Attack (a.k.a. Terrapin Attack) against ChaCha20-Poly1305 and Encrypt-then-MAC

Summary AsyncSSH v2.14.1 and earlier is vulnerable to a novel prefix truncation attack a.k.a. Terrapin attack, which allows a man-in-the-middle attacker to strip an arbitrary number of messages right after the initial key exchange, breaking SSH extension negotiation RFC8308 in the process and thu...

AZL-32224 CVE-2023-48795 affecting package moby-compose for versions less than 2.17.3-5

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted from the extension negotiation message, and a client and server may consequently end up with a connecti...

AZL-34901 CVE-2023-48795 affecting package kubernetes for versions less than 1.30.1-1

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted from the extension negotiation message, and a client and server may consequently end up with a connecti...

SUSE CVE-2017-3733

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...

Mbed TLS -- Local side channel attack on classical CBC decryption in (D)TLS

Manuel Pégourié-Gonnard reports: When decrypting/authenticating DTLS record in a connection using a CBC ciphersuite without the Encrypt-then-Mac extension RFC 7366, Mbed TLS used dummy rounds of the compression function associated with the hash used for HMAC in order to hide the length of the...

The vulnerability of the Encrypt-Then-Mac extension in the OpenSSL library, which allows a hacker to trigger a denial-of-service attack

The vulnerability of the Encrypt-Then-Mac extension in the OpenSSL library is related to insufficient validation of input data. Exploiting this vulnerability can allow a malicious actor to cause service failures remotely...

CVE-2017-3733

It was found that changing the ciphersuite during a renegotiation of the Encrypt-Then-Mac extension could result in a crash of the OpenSSL server or client...

OpenSSL handshake renegotiation process in the presence of the vulnerability can lead to denial of service-vulnerability warning-the black bar safety net

One, Foreword OpenSSL is a very popular General-purpose encryption library, available as a Web authentication service to provide SSL/TLS Protocol Implementation. Recently, there has been found in OpenSSL in the presence of several vulnerabilities. We've written several articles on the analysis of...

CVE-2017-3733

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...

CVE-2017-3733

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...

DEBIAN-CVE-2017-3733

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...

CVE-2017-3733

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...

UBUNTU-CVE-2017-3733

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...

CVE-2017-3733 Encrypt-Then-Mac renegotiation crash

During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake or vice-versa then this can cause OpenSSL 1.1.0 before 1.1.0e to crash dependent on ciphersuite. Both clients and servers are affected...