[Pkg-erlang-devel] Bug#1059002: erlang: CVE-2023-48795

[Salvatore Bonaccorso]

Source: erlang
Version: 1:25.2.3+dfsg-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for erlang.

CVE-2023-48795[0]:
| 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
| chacha20-poly1305 at openssh.com and (if CBC is used) the
| -etm at openssh.com 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, and
| libssh2 through 1.11.0; and there could be effects on Bitvise SSH
| through 9.31.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2023-48795
    https://www.cve.org/CVERecord?id=CVE-2023-48795
[1] https://github.com/erlang/otp/commit/ee67d46285394db95133709cef74b0c462d665aa

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore