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CVE-2019-16791— downgrade of effective Strict Transport Security (STS) policy in postfix-mta-sts-resolver

Quick assessment

Affected
Snawoot postfix-mta-sts-resolver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Postfix是一款开源的邮件传输代理。 postfix-mta-sts-resolver 0.5.1之前版本中存在安全漏洞。攻击者可利用该漏洞对有效的STS策略进行降级。

CVSS 6.9 · Medium EPSS 0.86% · P59

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2019-16791

Vulnerability Information
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Vulnerability Title
downgrade of effective Strict Transport Security (STS) policy in postfix-mta-sts-resolver
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在会话协商时选择低安全性的算法(算法降级)
Source: CVE Program / CVE List V5
Vulnerability Title
postfix-mta-sts-resolver 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Postfix是一款开源的邮件传输代理。 postfix-mta-sts-resolver 0.5.1之前版本中存在安全漏洞。攻击者可利用该漏洞对有效的STS策略进行降级。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Snawoot postfix-mta-sts-resolver < 0.5.1 -

II. Public POCs for CVE-2019-16791

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III. Intelligence Information for CVE-2019-16791

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Vendor Advisories for CVE-2019-16791 (1)

Other References for CVE-2019-16791 (1)

IV. Related Vulnerabilities

Same weakness: CWE-757