UBUNTU-CVE-2017-3737

OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.

References

Affected packages

Ubuntu:16.04:LTS / openssl

Package

Name: openssl
Purl: pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.10?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.0.2g-1ubuntu4.10

Affected versions

1.*

1.0.2d-0ubuntu1

1.0.2d-0ubuntu2

1.0.2e-1ubuntu1

1.0.2f-2ubuntu1

1.0.2g-1ubuntu2

1.0.2g-1ubuntu3

1.0.2g-1ubuntu4

1.0.2g-1ubuntu4.1

1.0.2g-1ubuntu4.2

1.0.2g-1ubuntu4.4

1.0.2g-1ubuntu4.5

1.0.2g-1ubuntu4.6

1.0.2g-1ubuntu4.8

1.0.2g-1ubuntu4.9

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl1.0.0",
            "binary_version": "1.0.2g-1ubuntu4.10"
        },
        {
            "binary_name": "openssl",
            "binary_version": "1.0.2g-1ubuntu4.10"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-3737.json"