CVE-2017-7526 Information disclosure in libgcrypt

What is CVE-2017-7526?

CVE-2017-7526 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 26 Jul 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

libgcrypt before version 1.7.8 is vulnerable to a cache side-channel attack resulting into a complete break of RSA-1024 while using the left-to-right method for computing the sliding-window expansion. The same attack is believed to work on RSA-2048 with moderately more computation. This side-channel requires that attacker can run arbitrary software on the hardware where the private RSA key is used.

Weakness: CWE-310, CWE-200

Which versions are affected by CVE-2017-7526?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Gnupg Libgcrypt.

How do I fix CVE-2017-7526?

Upgrade to a fixed version.

Is CVE-2017-7526 being exploited?

There is no known exploitation of CVE-2017-7526 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-2017-7526, AZL-41702, DEBIAN-CVE-2017-7526, DLA-1015-1, DLA-1080-1, DSA-3901-1 and 9 more.