Bug 1362016 – CVE-2016-6489 nettle: RSA/DSA code is vulnerable to cache-timing related attacks

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Bug 1362016 - (CVE-2016-6489) CVE-2016-6489 nettle: RSA/DSA code is vulnerable to cache-timing related attacks

Summary:	CVE-2016-6489 nettle: RSA/DSA code is vulnerable to cache-timing related attacks

Status:	ASSIGNED

Aliases:	CVE-2016-6489

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20160620,repor...
Keywords:	Reopened, Security

Depends On:	1362017 1362018 1362020 1362021 1362022 1364897 1429958 1429959
Blocks:	1323912
	Show dependency tree / graph

Reported:	2016-08-01 03:55 EDT by Huzaifa S. Sidhpurwala
Modified:	2017-03-08 13:18 EST (History)
CC List:	11 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:	It was found that nettle's RSA and DSA decryption code was vulnerable to cache-related side channel attacks. An attacker could use this flaw to recover the private key from a co-located virtual-machine instance.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-11-04 04:30:35 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:2582	normal	SHIPPED_LIVE	Moderate: nettle security and bug fix update	2016-11-03 08:08:24 EDT

Groups: None (edit)

Description Huzaifa S. Sidhpurwala 2016-08-01 03:55:45 EDT

A cache-related side channel was found in nettle's RSA and DSA decryption code. An attacker could use this flaw to recover the private key, from a co-located virtual-machine instance.


References:

https://eprint.iacr.org/2016/596.pdf
https://git.lysator.liu.se/nettle/nettle/commit/3fe1d6549765ecfb24f0b80b2ed086fdc818bff3

Comment 1 Huzaifa S. Sidhpurwala 2016-08-01 03:56:51 EDT

Created nettle tracking bugs for this issue:

Affects: fedora-all [bug 1362017]
Affects: epel-5 [bug 1362021]

Comment 2 Huzaifa S. Sidhpurwala 2016-08-01 03:56:59 EDT

Created mingw-nettle tracking bugs for this issue:

Affects: fedora-all [bug 1362018]
Affects: epel-7 [bug 1362022]

Comment 3 Huzaifa S. Sidhpurwala 2016-08-01 03:57:04 EDT

Created compat-nettle27 tracking bugs for this issue:

Affects: fedora-23 [bug 1362020]

Comment 4 Huzaifa S. Sidhpurwala 2016-08-01 03:59:23 EDT

Note:

As per: http://seclists.org/oss-sec/2016/q3/206 , the upstream fix has "some unintended side effects" and needs to be reviewed before being applied.

Comment 6 Nikos Mavrogiannopoulos 2016-08-08 03:36:47 EDT

The upstream author has included sanity checks at the functions using mpz_powm_sec() to prevent crashes by invalid private keys. As such, the unintended side-effects are no longer the case.

https://git.lysator.liu.se/nettle/nettle/commit/52b9223126b3f997c00d399166c006ae28669068

Comment 7 errata-xmlrpc 2016-11-03 15:31:30 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2582 https://rhn.redhat.com/errata/RHSA-2016-2582.html

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