Bug 1198147 (CVE-2015-0837)

Summary:	CVE-2015-0837 libgcrypt: last-level cache side-channel attack
Product:	[Other] Security Response	Reporter:	Vasyl Kaigorodov <vkaigoro>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acathrow, bcl, bmcclain, cfergeau, erik-fedora, idith, lsurette, michal.skrivanek, rdieter, rh-spice-bugs, rjones, srevivo, ykaul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libgcrypt 1.6.3, GnuPG 1.4.19	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-20 10:50:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1198152, 1198153, 1198154, 1198156
Bug Blocks:	1198150

Description Vasyl Kaigorodov 2015-03-03 13:19:49 UTC

Libgcrypt version 1.6.3 [1] and GnuPG version 1.4.19 [2] fix a side-channel attack on data-dependent timing variations in modular exponentiation, which can potentially lead to an information leak.

[1]: https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html
[2]: https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html

Comment 1 Vasyl Kaigorodov 2015-03-03 13:24:44 UTC

Created gnupg tracking bugs for this issue:

Affects: fedora-all [bug 1198154]

Comment 2 Vasyl Kaigorodov 2015-03-03 13:24:47 UTC

Created libgcrypt tracking bugs for this issue:

Affects: fedora-all [bug 1198152]

Comment 3 Vasyl Kaigorodov 2015-03-03 13:24:50 UTC

Created mingw-libgcrypt tracking bugs for this issue:

Affects: fedora-all [bug 1198153]

Comment 4 Vasyl Kaigorodov 2015-03-03 13:25:30 UTC

Created mingw-libgcrypt tracking bugs for this issue:

Affects: epel-all [bug 1198156]

Comment 5 Fedora Update System 2015-03-06 06:58:06 UTC

gnupg-1.4.19-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-03-13 17:01:54 UTC

libgcrypt-1.6.3-1.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2015-03-13 17:12:54 UTC

gnupg-1.4.19-1.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2015-03-14 09:16:03 UTC

gnupg-1.4.19-2.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2015-03-18 10:23:50 UTC

libgcrypt-1.6.3-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Huzaifa S. Sidhpurwala 2020-05-07 03:29:15 UTC

Statement:

Red Hat Product Security has rated this issue as having low security impact, a future update may address this flaw in the libgcrypt and gnupg2 packages.

The attack leading to this flaw, is difficult to conduct in practice especially for cross-vm environments, mainly because the attacker needs to run their timing attack script at the exact same time decryption runs on the victim machine. Also this is essentially a chosen ciphertext attack because the attacker provides the ciphertext which the victim needs to be decrypt. Such actions only work when there is sufficient social engineer involved.