USN-4267-1: ARM mbed TLS vulnerabilities

05 February 2020

Several security issues were fixed in mbedtls.

Releases

Packages

  • 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

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