CVE-2018-0495 Information disclosure in Libgcrypt before 1.7.10 and 1.8.x before 1.8.3

What is CVE-2018-0495?

CVE-2018-0495 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 13 Jun 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Weakness: CWE-203

Which versions are affected by CVE-2018-0495?

It affects 8 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Gnupg Libgcrypt, Oracle Traffic Director, Redhat Ansible Tower, Redhat Enterprise Linux Desktop and 2 more.

How do I fix CVE-2018-0495?

Upgrade to a fixed version.

Is CVE-2018-0495 being exploited?

There is no known exploitation of CVE-2018-0495 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2018-0495, DEBIAN-CVE-2018-0495, DLA-1405-1, DSA-4231-1, GHSA-q2v2-pgm4-m8c8, MGASA-2018-0301 and 7 more.