csaf_redhat - rhsa-2018:3600

RHSA-2018:3600

Vulnerability from csaf_redhat - Published: 2018-11-13 22:13 - Updated: 2025-11-21 18:06

Summary

Red Hat Security Advisory: python-cryptography security update

Notes

Topic

An update for python-cryptography is now available for Red Hat OpenStack Platform 13.0 (Queens). Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details

The python-cryptography packages contain a Python Cryptographic Authority's (PyCA's) cryptography library, which provides cryptographic primitives and recipes to Python developers. Security Fix(es): * python-cryptography: GCM tag forgery via truncated tag in finalize_with_tag API (CVE-2018-10903) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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      "title": "python-cryptography: GCM tag forgery via truncated tag in finalize_with_tag API"
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}

CVE-2018-10903 (GCVE-0-2018-10903)

Vulnerability from cvelistv5 – Published: 2018-07-30 15:00 – Updated: 2024-08-05 07:54

Summary

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.

Severity ?

7.5 (High)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE

CWE-20

Assigner

redhat

References

URL

Tags

	https://access.redhat.com/errata/RHSA-2018:3600	vendor-advisoryx_refsource_REDHAT
	https://usn.ubuntu.com/3720-1/	vendor-advisoryx_refsource_UBUNTU
	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2…	x_refsource_CONFIRM
	https://github.com/pyca/cryptography/pull/4342/co…	x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	[UNKNOWN]	python-cryptography	Affected: 2.3

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2018:3600

CVE-2018-10903 (GCVE-0-2018-10903)

Tags

Sightings

Nomenclature