Bug 1198147 (CVE-2015-0837) - CVE-2015-0837 libgcrypt: last-level cache side-channel attack
Summary: CVE-2015-0837 libgcrypt: last-level cache side-channel attack
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2015-0837
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1198152 1198153 1198154 1198156
Blocks: 1198150
TreeView+ depends on / blocked
 
Reported: 2015-03-03 13:19 UTC by Vasyl Kaigorodov
Modified: 2021-10-20 10:50 UTC (History)
13 users (show)

Fixed In Version: libgcrypt 1.6.3, GnuPG 1.4.19
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-10-20 10:50:38 UTC
Embargoed:

Attachments (Terms of Use)

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.
Note You need to log in before you can comment on or make changes to this bug.