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CVE-2023-42118— Exim libspf2 Integer Underflow Remote Code Execution Vulnerability

Quick assessment

Affected
Exim libspf2
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libspf2是一个库，它允许电子邮件系统（例如 Sendmail、Postfix、Exim、Zmailer 和 MS Exchange）检查SPF 记录并确保电子邮件得到了来自它的域名的授权。这可以防止垃圾邮件发送者、诈骗者和电子邮件病毒/蠕虫常用的电子邮件伪造。 libspf2存在安全漏洞。攻击者利用该漏洞可以执行任意代码。

AI Predicted 8.6 Difficulty: Easy EPSS 19.01% · P97
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I. Basic Information for CVE-2023-42118

Vulnerability Information
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Vulnerability Title
Exim libspf2 Integer Underflow Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17578.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
libspf2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libspf2是一个库，它允许电子邮件系统（例如 Sendmail、Postfix、Exim、Zmailer 和 MS Exchange）检查SPF 记录并确保电子邮件得到了来自它的域名的授权。这可以防止垃圾邮件发送者、诈骗者和电子邮件病毒/蠕虫常用的电子邮件伪造。 libspf2存在安全漏洞。攻击者利用该漏洞可以执行任意代码。
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
Exim libspf2 exim 4.96-RC0-14-24b8ed847-XX -

II. Public POCs for CVE-2023-42118

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III. Intelligence Information for CVE-2023-42118

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Vendor Advisories for CVE-2023-42118 (1)

Same Patch Batch · Exim · 2024-05-03 · 6 CVEs total

CVE-2023-42114 Exim NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability
CVE-2023-42119 Exim dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability
CVE-2023-42116 Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2023-42117 Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability
CVE-2023-42115 Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability

IV. Related Vulnerabilities

Same product: libspf2
Same vendor: Exim
Same weakness: CWE-191

V. Comments for CVE-2023-42118

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