USN-7292-1: Dropbear vulnerabilities

25 February 2025

Several security issues were fixed in dropbear.

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Releases

Packages

  • dropbear - lightweight SSH2 server and client

Details

Manfred Kaiser discovered that Dropbear through 2020.81 does not properly
check the available authentication methods in the client-side SSH code.
An attacker could use this vulnerability to gain unauthorized access to
remote systems. (CVE-2021-36369)

Fabian Bäumer, Marcus Brinkmann, and Jörg Schwenk discovered that the SSH
transport protocol implementation in Dropbear had weak integrity checks.
An attacker could use this vulnerability to bypass security features
like encryption and integrity checks. (CVE-2023-48795)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.

References

Related notices

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