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Ubuntu Security Notice USN-4891-1

Ubuntu Security Notice USN-4891-1
Posted Mar 26, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4891-1 - It was discovered that OpenSSL incorrectly handled certain renegotiation ClientHello messages. A remote attacker could use this issue to cause OpenSSL 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-2021-3449
MD5 | 65dc6a577fcb68c0413c66300d99e501

Ubuntu Security Notice USN-4891-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4891-1
March 25, 2021

openssl vulnerability
==========================================================================

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

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

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

It was discovered that OpenSSL incorrectly handled certain renegotiation
ClientHello messages. A remote attacker could use this issue to cause
OpenSSL 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:
libssl1.1 1.1.1f-1ubuntu4.3

Ubuntu 20.04 LTS:
libssl1.1 1.1.1f-1ubuntu2.3

Ubuntu 18.04 LTS:
libssl1.1 1.1.1-1ubuntu2.1~18.04.9

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-4891-1
CVE-2021-3449

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu4.3
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.3
https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.9

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