GHSA-fcf9-3qw3-gxmj

Suggest an improvement
Source
https://github.com/advisories/GHSA-fcf9-3qw3-gxmj
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2018/07/GHSA-fcf9-3qw3-gxmj/GHSA-fcf9-3qw3-gxmj.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-fcf9-3qw3-gxmj
Aliases
Published
2018-07-31T18:28:09Z
Modified
2024-09-13T18:23:23Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
PyCA Cryptography vulnerable to GCM tag forgery
Details

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.

Database specific 
{
    "cwe_ids":  [
        "CWE-20"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2020-06-16T21:34:18Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}
References

Affected packages

PyPI / cryptography

Package

Name
cryptography
View open source insights on deps.dev
Purl
pkg:pypi/cryptography

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.9.0
Fixed
2.3

Affected versions

1.*
1.9
2.*
2.0
2.0.1
2.0.2
2.0.3
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.2
2.2.1
2.2.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2018/07/GHSA-fcf9-3qw3-gxmj/GHSA-fcf9-3qw3-gxmj.json"