CVE-2018-10903

Impact:
Moderate
Public Date:
2018-07-18
CWE:
CWE-20
Bugzilla:
1602931: CVE-2018-10903 python-cryptography: GCM tag forgery via truncated tag in finalize_with_tag API
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.

Find out more about CVE-2018-10903 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 7.5
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact None
Availability Impact None

Affected Packages State

Platform Package State
Red Hat Virtualization 4 python-cryptography Not affected
Red Hat OpenStack Platform 9.0 python-cryptography Not affected
Red Hat OpenStack Platform 8.0 (Liberty) python-cryptography Not affected
Red Hat OpenStack Platform 13.0 (Queens) python-cryptography Affected
Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 python-cryptography Not affected
Red Hat Enterprise Linux 7 python-cryptography Not affected

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