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: NEW
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: 2020-05-07 03:29 UTC (History)
15 users (show)

Fixed In Version: libgcrypt 1.6.3, GnuPG 1.4.19
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:


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.


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