------------------------------------------------------------------------- Debian LTS Advisory DLA-3719-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Guilhem Moulin January 25, 2024 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : phpseclib Version : 1.0.19-3~deb10u2 CVE ID : CVE-2023-48795 It was discovered that phpseclib, a PHP library for arbitrary-precision integer arithmetic, was vulnerable to the so-called Terrapin Attack. The SSH transport protocol with certain OpenSSH extensions, 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). For Debian 10 buster, this problem has been fixed in version 1.0.19-3~deb10u2. We recommend that you upgrade your phpseclib packages. For the detailed security status of phpseclib please refer to its security tracker page at: https://security-tracker.debian.org/tracker/phpseclib Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
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