SB2025042002 - Debian update for erlang
Published: April 20, 2025 Updated: January 4, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Inadequate encryption strength (CVE-ID: CVE-2023-48795)
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to incorrect implementation of the SSH Binary Packet Protocol (BPP), which mishandles the handshake phase and the use of sequence numbers. A remote attacker can perform MitM attack and delete the SSH2_MSG_EXT_INFO message sent before authentication starts, allowing the attacker to disable a subset of the keystroke timing obfuscation features introduced in OpenSSH 9.5.
The vulnerability was dubbed "Terrapin attack" and it affects both client and server implementations.
2) Uncontrolled memory allocation (CVE-ID: CVE-2025-26618)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper handling of SFTP packets. A remote attacker can send multiple SFTP packets to the application and consume large amount of memory, resulting in a denial of service.
3) Uncontrolled Memory Allocation (CVE-ID: CVE-2025-30211)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to implementation does not verify RFC specified limits on algorithm names provided in KEX init message. A remote attacker can cause a denial of service (DoS) condition on the target system.
4) Missing Authentication for Critical Function (CVE-ID: CVE-2025-32433)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to missing authentication in Erlang/OTP SSH server. A remote non-authenticated attacker can send specially crafted messages to the server and execute arbitrary code on the system.
Remediation
Install update from vendor's website.