跳转到帖子

Amazon Linux AMI: CVE-2023-48795: Security patch for openssh (ALAS-2023-1898)

recommended_posts

发布于
  • Members

Amazon Linux AMI: CVE-2023-48795: Security patch for openssh (ALAS-2023-1898)

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:N/I:C/A:N)
Published
12/18/2023
Created
12/21/2023
Added
12/19/2023
Modified
01/28/2025

Description

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, and golang.org/x/crypto before 0.17.0; and there could be effects on Bitvise SSH through 9.31 and libssh through 0.10.5.

Solution(s)

  • amazon-linux-upgrade-openssh

References

  • ALAS-2023-1898
  • CVE-2023-48795
  • 查看数 703
  • 已创建
  • 最后回复

参与讨论

你可立刻发布并稍后注册。 如果你有帐户,立刻登录发布帖子。
注意:你的帖子需要版主批准后才能看到。

游客
回帖…