Information disclosure in openssl (Alpine package)

1) Information disclosure

EUVDB-ID: #VU5894

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-7055

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to decrypt certain data.

The vulnerability exists in OpenSSL implementation due to propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits. A remote attacker can launch attacks against RSA, DSA and DH private keys and decrypt information, passed over encrypted channels. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation.

Successful exploitation of the vulnerability may allow an attacker in certain conditions to launch attacks against OpenSSL clients.

Mitigation

Install update from vendor's website.

Vulnerable software versions

openssl (Alpine package): 1.0.1h-r0 - 1.0.2h-r4

CPE2.3

• cpe:2.3:o:alpine:openssl_alpine_package:1.0.1h-r0:*:*:*:*:alpine_linux:*:2.4
• cpe:2.3:o:alpine:openssl_alpine_package:1.0.1i-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:openssl_alpine_package:1.0.1q-r0:*:*:*:*:alpine_linux:*:2.7

External links

https://git.alpinelinux.org/aports/commit/?id=3eb2d51b3b6d1670a7763dddd331789b32fc36ad
https://git.alpinelinux.org/aports/commit/?id=a84acb79718101fdfd08d8fd21c5b8ce30cb6531
https://git.alpinelinux.org/aports/commit/?id=f8bf827fae4885976509355d07182af03796ddda

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.