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CVE-2022-31256— sendmail: mail to root privilege escalation via sm-client.pre script

Quick assessment

Affected
SUSE openSUSE Factory
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.

systemd是德国Lennart Poettering个人开发者的一款基于Linux的系统和服务管理器。该产品兼容了SysV和LSB的启动脚本，且提供了一个用来表示系统服务间依赖关系的框架。 systemd 1.1版本至8.17.1版本存在后置链接漏洞，该漏洞源于 systemd sendmail 服务调用的脚本中存在文件访问错误链接解析（“链接跟随”）漏洞。攻击者利用该漏洞升级权限。

CVSS 7.7 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2022-31256

Vulnerability Information
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Vulnerability Title
sendmail: mail to root privilege escalation via sm-client.pre script
Source: CVE Program / CVE List V5
Vulnerability Description
A Improper Link Resolution Before File Access ('Link Following') vulnerability in a script called by the sendmail systemd service of openSUSE Factory allows local attackers to escalate from user mail to root. This issue affects: SUSE openSUSE Factory sendmail versions prior to 8.17.1-1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
systemd 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
systemd是德国Lennart Poettering个人开发者的一款基于Linux的系统和服务管理器。该产品兼容了SysV和LSB的启动脚本，且提供了一个用来表示系统服务间依赖关系的框架。 systemd 1.1版本至8.17.1版本存在后置链接漏洞，该漏洞源于 systemd sendmail 服务调用的脚本中存在文件访问错误链接解析（“链接跟随”）漏洞。攻击者利用该漏洞升级权限。
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
SUSE openSUSE Factory sendmail ~ 8.17.1-1.1 -

II. Public POCs for CVE-2022-31256

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III. Intelligence Information for CVE-2022-31256

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Vendor Advisories for CVE-2022-31256 (1)

IV. Related Vulnerabilities

Same product: openSUSE Factory
Same vendor: SUSE
Same weakness: CWE-59

V. Comments for CVE-2022-31256

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