SB2017012619 - Information disclosure in openssl (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) Information disclosure (CVE-ID: CVE-2016-7055)

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.

Remediation

Install update from vendor's website.

References

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