python-cryptography up to 2.4 API input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in python-cryptography up to 2.4. The impacted element is an unknown function of the component API. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2018-10903. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in python-cryptography up to 2.4 (Programming Language Software). It has been rated as critical. This issue affects some unknown functionality of the component API. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 07/28/2018. The weakness was disclosed 07/30/2018 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2018-10903 since 05/09/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 111269 (Ubuntu 18.04 LTS : python-cryptography vulnerability (USN-3720-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171862 (OpenSUSE Security Update for python-cryptography (openSUSE-SU-2018:3445-1)).

Upgrading to version =1.9.0 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111269). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 111269
Nessus Name: Ubuntu 18.04 LTS : python-cryptography vulnerability (USN-3720-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: python-cryptography =1.9.0
Patch: github.com

Timelineinfo

05/09/2018 🔍
07/23/2018 +75 days 🔍
07/24/2018 +1 days 🔍
07/28/2018 +4 days 🔍
07/30/2018 +1 days 🔍
07/30/2018 +0 days 🔍
07/31/2018 +1 days 🔍
04/27/2023 +1731 days 🔍

Sourcesinfo

Advisory: RHSA-2018:3600
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-10903 (🔍)
GCVE (CVE): GCVE-0-2018-10903
GCVE (VulDB): GCVE-100-122327

Entryinfo

Created: 07/31/2018 07:06
Updated: 04/27/2023 18:22
Changes: 07/31/2018 07:06 (70), 03/11/2020 10:09 (3), 04/27/2023 18:22 (5)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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