CVE-2017-7526

Impact:
Moderate
Public Date:
2017-06-29
CWE:
CWE-200
Bugzilla:
1466265: CVE-2017-7526 libgcrypt: Use of left-to-right sliding window method allows full RSA key recovery

The MITRE CVE dictionary describes this issue as:

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.

Find out more about CVE-2017-7526 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This side-channel attack requires that the attacker can run arbitrary software on the hardware where the private RSA key is used. Allowing execute access to a box with private keys should be considered as an unsafe security practice, anyway. Thus in practice there are easier ways to access the private keys than to mount this side-channel attack. However, on boxes with virtual machines this attack may be used by one VM to steal private keys from another VM.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 6.1
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality High
Integrity Impact None
Availability Impact None

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 7 libgcrypt Will not fix
Red Hat Enterprise Linux 6 libgcrypt Will not fix
Red Hat Enterprise Linux 5 libgcrypt Will not fix
RHEV Manager 3 mingw-virt-viewer Will not fix

Acknowledgements

Red Hat would like to thank the Libgcrypt project for reporting this issue.

External References

Last Modified

CVE description copyright © 2017, The MITRE Corporation