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CVE-2021-25317— cups: ownership of /var/log/cups allows the lp user to create files as root

Quick assessment

Affected
SUSE SUSE Linux Enterprise Server 11-SP4-LTSS
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.

Apple CUPS是美国苹果（Apple）公司的一套开源的用于OS X和类Unix系统的打印系统。该系统基于Internet打印协议（IPP），提供大多数PostScript和raster打印机服务。 CUPS 存在安全漏洞。该漏洞源于/ var / log / cups目录的所有权分配给了 用户。这样可以使具有这种特权用户的攻击者使用符号链接攻击在任意位置创建空文件，或强制打开和关闭任意文件。

CVSS 3.3 · Low EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-25317

Vulnerability Information
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Vulnerability Title
cups: ownership of /var/log/cups allows the lp user to create files as root
Source: CVE Program / CVE List V5
Vulnerability Description
A Incorrect Default Permissions vulnerability in the packaging of cups of SUSE Linux Enterprise Server 11-SP4-LTSS, SUSE Manager Server 4.0, SUSE OpenStack Cloud Crowbar 9; openSUSE Leap 15.2, Factory allows local attackers with control of the lp users to create files as root with 0644 permissions without the ability to set the content. This issue affects: SUSE Linux Enterprise Server 11-SP4-LTSS cups versions prior to 1.3.9. SUSE Manager Server 4.0 cups versions prior to 2.2.7. SUSE OpenStack Cloud Crowbar 9 cups versions prior to 1.7.5. openSUSE Leap 15.2 cups versions prior to 2.2.7. openSUSE Factory cups version 2.3.3op2-2.1 and prior versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Apple CUPS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apple CUPS是美国苹果（Apple）公司的一套开源的用于OS X和类Unix系统的打印系统。该系统基于Internet打印协议（IPP），提供大多数PostScript和raster打印机服务。 CUPS 存在安全漏洞。该漏洞源于/ var / log / cups目录的所有权分配给了`lp`用户。这样可以使具有这种特权用户的攻击者使用符号链接攻击在任意位置创建空文件，或强制打开和关闭任意文件。
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 SUSE Linux Enterprise Server 11-SP4-LTSS cups ~ 1.3.9 -
SUSE SUSE Manager Server 4.0 cups ~ 2.2.7 -
SUSE SUSE OpenStack Cloud Crowbar 9 cups ~ 1.7.5 -
openSUSE openSUSE Leap 15.2 cups ~ 2.2.7 -
openSUSE Factory cups ~ 2.3.3op2-2.1 -

II. Public POCs for CVE-2021-25317

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III. Intelligence Information for CVE-2021-25317

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Vendor Advisories for CVE-2021-25317 (1)

Mailing List Discussions for CVE-2021-25317 (3)

IV. Related Vulnerabilities

Same product: SUSE Linux Enterprise Server 11-SP4-LTSS
Same vendor: SUSE
Same weakness: CWE-276

V. Comments for CVE-2021-25317

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