CVE-2019-16791

downgrade of effective Strict Transport Security (STS) policy in postfix-mta-sts-resolver

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.

En postfix-mta-sts-resolver versiones anteriores a 0.5.1, todos los usuarios pueden recibir una respuesta incorrecta del demonio bajo condiciones extrañas, renderizando una degradación de la política STS efectiva.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-09-24 CVE Reserved
2020-01-22 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://gist.github.com/Snawoot/b9da85d6b26dea5460673b29df1adc6b	2020-10-23
https://github.com/Snawoot/postfix-mta-sts-resolver/security/advisories/GHSA-h92m-42h4-82f6	2020-10-23

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Postfix-mta-sts-resolver Project Search vendor "Postfix-mta-sts-resolver Project"		Postfix-mta-sts-resolver Search vendor "Postfix-mta-sts-resolver Project" for product "Postfix-mta-sts-resolver"				< 0.5.1 Search vendor "Postfix-mta-sts-resolver Project" for product "Postfix-mta-sts-resolver" and version " < 0.5.1"		-		Affected