=========================================================================Ubuntu Security Notice USN-4267-1
February 05, 2020

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in mbedtls.

Software Description:
- mbedtls: lightweight crypto and SSL/TLS library - crypto library

Details:

It was discovered that mbedtls has a bounds-check bypass through an integer
overflow that can be used by an attacked to execute arbitrary code or cause a
denial of service.
(CVE-2017-18187)

It was discovered that mbedtls has a vulnerability where an attacker could
execute arbitrary code or cause a denial of service (buffer overflow)
via a crafted certificate chain that is mishandled during RSASSA-PSS
signature verification within a TLS or DTLS session.
(CVE-2018-0487)

It was discovered that mbedtls has a vulnerability where an attacker could
execute arbitrary code or cause a denial of service (heap corruption) via a
crafted application packet within a TLS or DTLS session.
(CVE-2018-0488)

It was discovered that mbedtls has a vulnerability that allows remote
attackers to achieve partial plaintext recovery (for a CBC based ciphersuite)
via a timing-based side-channel attack.
(CVE-2018-0497)

It was discovered that mbedtls has a vulnerability that allows local users to
achieve partial plaintext recovery (for a CBC based ciphersuite) via a
cache-based side-channel attack.
(CVE-2018-0498)

Update instructions:

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

Ubuntu 16.04 LTS:
  libmbedcrypto0                  2.2.1-2ubuntu0.3
  libmbedtls10                    2.2.1-2ubuntu0.3
  libmbedx509-0                   2.2.1-2ubuntu0.3

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

References:
  https://ubuntu.com/security/notices/USN-4267-1
  CVE-2017-18187, CVE-2018-0487, CVE-2018-0488, CVE-2018-0497,
  CVE-2018-0498

Package Information:
  https://launchpad.net/ubuntu/+source/mbedtls/2.2.1-2ubuntu0.3

Ubuntu 4267-1: ARM mbed TLS vulnerabilities

February 5, 2020
Several security issues were fixed in mbedtls.

Summary

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: libmbedcrypto0 2.2.1-2ubuntu0.3 libmbedtls10 2.2.1-2ubuntu0.3 libmbedx509-0 2.2.1-2ubuntu0.3 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4267-1

CVE-2017-18187, CVE-2018-0487, CVE-2018-0488, CVE-2018-0497,

CVE-2018-0498

Severity
February 05, 2020

Package Information

https://launchpad.net/ubuntu/+source/mbedtls/2.2.1-2ubuntu0.3

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