medium
5.1
CWE
203 200
Advisory Published
CVE Published
Updated

CVE-2018-0495: Infoleak

First published: Wed Jun 13 2018(Updated: )

An implementation flaw was discovered in multiple cryptographic libraries that allows a side-channel based attacker to recover ECDSA or DSA private keys. When these cryptographic libraries use the private key to create a signature, such as for a TLS or SSH connection, they inadvertently leak information through memory caches. An unprivileged attacker running on the same machine can collect the information from a few thousand signatures and recover the value of the private key. External References: <a href="https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/">https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/</a>

Credit: security@debian.org

Affected SoftwareAffected VersionHow to fix
redhat/jbcs-httpd24-httpd<0:2.4.29-40.jbcs.el6
0:2.4.29-40.jbcs.el6
redhat/jbcs-httpd24-openssl<1:1.0.2n-15.jbcs.el6
1:1.0.2n-15.jbcs.el6
redhat/jbcs-httpd24-httpd<0:2.4.29-40.jbcs.el7
0:2.4.29-40.jbcs.el7
redhat/jbcs-httpd24-openssl<1:1.0.2n-15.jbcs.el7
1:1.0.2n-15.jbcs.el7
redhat/openssl<1:1.0.2k-16.el7
1:1.0.2k-16.el7
redhat/nspr<0:4.21.0-1.el7
0:4.21.0-1.el7
redhat/nss<0:3.44.0-4.el7
0:3.44.0-4.el7
redhat/nss-softokn<0:3.44.0-5.el7
0:3.44.0-5.el7
redhat/nss-util<0:3.44.0-3.el7
0:3.44.0-3.el7
redhat/nss-softokn<0:3.28.3-9.el7_4
0:3.28.3-9.el7_4
redhat/nss-softokn<0:3.36.0-6.el7_5
0:3.36.0-6.el7_5
redhat/nss-softokn<0:3.36.0-6.el7_6
0:3.36.0-6.el7_6
debian/libgcrypt20
1.8.7-6
1.10.1-3
1.11.0-7
Libgcrypt<1.7.10
Libgcrypt>=1.8.0<1.8.3
Ubuntu=12.04
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=17.10
Ubuntu=18.04
Ubuntu=18.10
Debian=8.0
Debian=9.0
Red Hat Ansible Tower=3.3
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Workstation=7.0
Oracle Traffic Director=11.1.1.9.0

Remedy

https://dev.gnupg.org/T4011

Remedy

https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=9010d1576e278a4274ad3f4aa15776c28f6ba965

Remedy

https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2018-0495?

    CVE-2018-0495 is rated as high severity due to the potential for private key recovery through a side-channel attack.

  • How do I fix CVE-2018-0495?

    To mitigate CVE-2018-0495, update to the fixed versions of the affected packages listed in the vulnerability report.

  • Which software is affected by CVE-2018-0495?

    CVE-2018-0495 affects several cryptographic libraries including jbcs-httpd24-httpd and jbcs-httpd24-openssl among others.

  • What type of attack does CVE-2018-0495 enable?

    CVE-2018-0495 enables a side-channel attack that can lead to the recovery of ECDSA or DSA private keys.

  • Is CVE-2018-0495 limited to specific operating systems?

    CVE-2018-0495 affects multiple operating systems, including various versions of Red Hat Enterprise Linux and Debian.

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