Input validation error in GnuPG - CVE-2015-0837

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Main Vulnerability Database Vulnerabilities #VU33822

Input validation error in GnuPG - CVE-2015-0837

Published: November 29, 2019 / Updated: August 4, 2020


Vulnerability identifier: #VU33822
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-0837
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitive information by leveraging timing differences when accessing a pre-computed table during modular exponentiation, related to a "Last-Level Cache Side-Channel Attack."


Affected software

GnuPG
Amazon Linux AMI
Gentoo Linux
Fedora
Slackware Linux
gnupg1 (Alpine package)
gnupg
mingw-libgcrypt
libgcrypt

How to mitigate CVE-2015-0837

Install update from vendor's website.

GnuPG - update to 1.4.19
gnupg1 (Alpine package) - update to 1.4.19-r0
gnupg - addressed in versions 1.4.19-1.fc21, 1.4.19-1.fc22
mingw-libgcrypt - addressed in versions 1.6.3-1.el7, 1.6.3-1.fc21, 1.6.3-1.fc22
libgcrypt - addressed in versions 1.6.3-1.fc21, 1.6.3-1.fc22

External References

Related Security Bulletins