CVE-2016-7055 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 bit...
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| debian/openssl(Debian:12) | < 1.1.0c-1 | 1.1.0c-1 |
| debian/openssl(Debian:13) | < 1.1.0c-1 | 1.1.0c-1 |
| debian/openssl(Debian:14) | < 1.1.0c-1 | 1.1.0c-1 |
| OpenSSL | >= 1.0.2, < 1.0.2k | 1.0.2k |
| OpenSSL | >= 1.1.0, < 1.1.0c | 1.1.0c |
| nodejs node.js | >= 4.0.0, <= 4.1.2 | No fix listed |
| nodejs node.js | >= 4.2.0, < 4.7.3 | 4.7.3 |
| nodejs node.js | >= 6.0.0, <= 6.8.1 | No fix listed |
| nodejs node.js | >= 6.9.0, < 6.9.5 | 6.9.5 |
| nodejs node.js | >= 7.0.0, < 7.5.0 | 7.5.0 |
| alpine/openssl(Alpine:v3.2) | >= 1.0.2, < 1.0.2k-r0 | 1.0.2k-r0 |
| alpine/openssl(Alpine:v3.3) | >= 1.0.2, < 1.0.2k-r0 | 1.0.2k-r0 |
| alpine/openssl(Alpine:v3.4) | >= 1.0.2, < 1.0.2k-r0 | 1.0.2k-r0 |
References
- Debian Security Tracker CVE-2016-7055 vendor-advisory
- www.oracle.com patch third-party-advisory
- www.oracle.com patch third-party-advisory
- www.oracle.com patch third-party-advisory
- 94242 third-party-advisory us-government-resource vdb-entry
- 1037261 third-party-advisory vdb-entry
- RHSA-2018:2185 third-party-advisory vendor-advisory
- RHSA-2018:2186 third-party-advisory vendor-advisory
- RHSA-2018:2187 third-party-advisory vendor-advisory
- h20566.www2.hpe.com third-party-advisory
- h20566.www2.hpe.com third-party-advisory vdb-entry
- FreeBSD-SA-17:02 third-party-advisory vendor-advisory
- GLSA-201702-07 third-party-advisory vendor-advisory
- www.openssl.org vendor-advisory
- www.oracle.com patch third-party-advisory
- www.tenable.com third-party-advisory
- security.alpinelinux.org vendor-advisory