CVE Vulnerability

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.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903 Issue Tracking Patch
https://usn.ubuntu.com/3720-1/ Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3600
Configurations

Configuration 1

cpe:2.3:a:cryptography:python-cryptography:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
Information

Published : 2018-07-30 04:29

Updated : 2021-08-04 05:14

NVD link : CVE-2018-10903

Mitre link : CVE-2018-10903

Products Affected
No products.
CWE
CWE-20