==========================================================================
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
—–BEGIN PGP SIGNATURE—–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=4NQl
—–END PGP SIGNATURE—–
—
