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CVE-2022-3620— Exim DMARC dmarc.c dmarc_dns_lookup use after free

Quick assessment

Affected
unspecified Exim
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.

Exim是一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim存在资源管理错误漏洞，该漏洞源于DMARC Handler组件中dmarc.c文件的dmarc_dns_lookup函数存在问题，可能导致释放后重用。

CVSS 5.6 · Medium EPSS 0.80% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-3620

Vulnerability Information
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Vulnerability Title
Exim DMARC dmarc.c dmarc_dns_lookup use after free
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in Exim and classified as problematic. This issue affects the function dmarc_dns_lookup of the file dmarc.c of the component DMARC Handler. The manipulation leads to use after free. The attack may be initiated remotely. The name of the patch is 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-211919.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Exim 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Exim是一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim存在资源管理错误漏洞，该漏洞源于DMARC Handler组件中dmarc.c文件的dmarc_dns_lookup函数存在问题，可能导致释放后重用。
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
unspecified Exim n/a -

II. Public POCs for CVE-2022-3620

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III. Intelligence Information for CVE-2022-3620

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Mailing List Discussions for CVE-2022-3620 (3)

Other References for CVE-2022-3620 (1)

IV. Related Vulnerabilities

Same product: Exim
Same vendor: unspecified
Same weakness: CWE-119

V. Comments for CVE-2022-3620

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