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Ubuntu Security Notice USN-4762-1

Ubuntu Security Notice USN-4762-1
Posted Mar 10, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4762-1 - It was discovered that the OpenSSH ssh-agent incorrectly handled memory. A remote attacker able to connect to the agent could use this issue to cause it to crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-28041
SHA-256 | 57b873eb3a79a6016c2c1850ac174d4ce1f24861ef1deba79a7e19040a68f8b4

Ubuntu Security Notice USN-4762-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4762-1
March 10, 2021

openssh vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS

Summary:

OpenSSH could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- openssh: secure shell (SSH) for secure access to remote machines

Details:

It was discovered that the OpenSSH ssh-agent incorrectly handled memory. A
remote attacker able to connect to the agent could use this issue to cause
it to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 20.10:
openssh-client 1:8.3p1-1ubuntu0.1

Ubuntu 20.04 LTS:
openssh-client 1:8.2p1-4ubuntu0.2

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

References:
https://ubuntu.com/security/notices/USN-4762-1
CVE-2021-28041

Package Information:
https://launchpad.net/ubuntu/+source/openssh/1:8.3p1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/openssh/1:8.2p1-4ubuntu0.2
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