Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2017-3738

Published: 7 December 2017

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.

Notes

AuthorNote
leosilva
"This only affects processors that support the AVX2 but not ADX extensions
like Intel Haswell (4th generation)."

Priority

Low

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
openssl098
Launchpad, Ubuntu, Debian
disco Does not exist

artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was needs-triage)
upstream Needs triage

xenial Does not exist

openssl1.0
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(1.0.2n-1ubuntu4)
cosmic Not vulnerable
(1.0.2n-1ubuntu4)
disco Does not exist

trusty Does not exist

upstream
Released (1.0.2n)
xenial Does not exist

openssl
Launchpad, Ubuntu, Debian
artful
Released (1.0.2g-1ubuntu13.3)
bionic
Released (1.1.0g-2ubuntu3)
cosmic
Released (1.1.0g-2ubuntu3)
disco
Released (1.1.0g-2ubuntu3)
trusty Not vulnerable
(code not present)
upstream
Released (1.0.2n,1.1.0h)
xenial
Released (1.0.2g-1ubuntu4.10)
zesty
Released (1.0.2g-1ubuntu11.4)
Patches:
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=ca51bafc1a88d8b8348f5fd97adc5d6ca93f8e76 (1.0.2)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=e502cc86df9dafded1694fceb3228ee34d11c11a (1.1.0)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N