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Ubuntu Security Notice USN-4267-1

Ubuntu Security Notice USN-4267-1
Posted Feb 6, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4267-1 - 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. It was discovered that mbedtls has a vulnerability where an attacker could execute arbitrary code or cause a denial of service via a crafted certificate chain that is mishandled during RSASSA-PSS signature verification within a TLS or DTLS session. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary
systems | linux, ubuntu
advisories | CVE-2017-18187, CVE-2018-0487, CVE-2018-0488, CVE-2018-0497, CVE-2018-0498
MD5 | 5f33dbd0ff4480220611555ae9976280

Ubuntu Security Notice USN-4267-1

Change Mirror Download
==========================================================================
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://usn.ubuntu.com/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
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