SB2017012621 - Information disclosure in openssl (Alpine package)

Description

This security bulletin contains information about 1 vulnerability.

1) Information disclosure (CVE-ID: CVE-2017-3732)

CWE-ID: CWE-310 - Cryptographic Issues

CVSSv4: 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

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to propagating error in the x86_64 Montgomery squaring procedure. A remote attacker with access to unpatched vulnerable system that uses a shared private key with Diffie-Hellman (DH) parameters set can gain unauthorized access to sensitive private key information.

According to vendor’s advisory, this vulnerability is unlikely to be exploited in real-world attacks, as it requires significant resources and online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients.

Vulnerability exploitation against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely.

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