CVE-2018-10903

Advisory

Bigchaindb-driver 0.5.2 includes a fix for CVE-2018-10903: A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

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Added
^^^^^

* Cap exponential backoff depending on timeout value for reasonable waiting time in event of network recovery. `470 <https://github.com/bigchaindb/bigchaindb-driver/pull/470>`
* Update cryptoconditions dependency because of security vulnerability CVE-2018-10903. `472 <https://github.com/bigchaindb/bigchaindb-driver/pull/472>`

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10903
• https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
• https://usn.ubuntu.com/3720-1/
• https://access.redhat.com/errata/RHSA-2018:3600