CVE-2016-7055

Name	CVE-2016-7055
Description	There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openssl (PTS)	jessie, jessie (lts)	1.0.1t-1+deb8u21	fixed
	stretch (security)	1.1.0l-1~deb9u6	fixed
	stretch (lts), stretch	1.1.0l-1~deb9u9	fixed
	buster (security), buster, buster (lts)	1.1.1n-0+deb10u6	fixed
	bullseye	1.1.1w-0+deb11u1	fixed
	bullseye (security)	1.1.1w-0+deb11u2	fixed
	bookworm	3.0.15-1~deb12u1	fixed
	bookworm (security)	3.0.14-1~deb12u2	fixed
	sid, trixie	3.3.2-2	fixed
openssl1.0 (PTS)	stretch (security)	1.0.2u-1~deb9u7	fixed
	stretch (lts), stretch	1.0.2u-1~deb9u9	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency
openssl	source	wheezy	(not affected)
openssl	source	jessie	(not affected)
openssl	source	(unstable)	1.1.0c-1	low
openssl1.0	source	(unstable)	1.0.2k-1	low

Notes

[jessie] - openssl <not-affected> (Only affects 1.0.2 and 1.1.0)
[wheezy] - openssl <not-affected> (Only affects 1.0.2 and 1.1.0)
https://www.openssl.org/news/secadv/20161110.txt
https://git.openssl.org/?p=openssl.git;a=commit;h=2fac86d9abeaa643677d1ffd0a139239fdf9406a