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CVE-2023-3773— Kernel: xfrm: out-of-bounds read of xfrma_mtimer_thresh nlattr

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 9
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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 XFRM 子系统存在一个漏洞，该漏洞允许具有CAP_NET_ADMIN特权的恶意用户在解析netlink属性时导致XFRMA_MTIMER_THRESH的4字节越界读取，从而导致潜在的敏感堆数据泄漏到用户空间。

CVSS 5.5 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2023-3773

Vulnerability Information
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Vulnerability Title
Kernel: xfrm: out-of-bounds read of xfrma_mtimer_thresh nlattr
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 XFRM 子系统存在一个漏洞，该漏洞允许具有CAP_NET_ADMIN特权的恶意用户在解析netlink属性时导致XFRMA_MTIMER_THRESH的4字节越界读取，从而导致潜在的敏感堆数据泄漏到用户空间。
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
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.8.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.8.1.el9_3 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2023-3773

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III. Intelligence Information for CVE-2023-3773

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Vendor Advisories for CVE-2023-3773 (4)

Mailing List Discussions for CVE-2023-3773 (1)

Same Patch Batch · Red Hat · 2023-07-25 · 3 CVEs total

CVE-2023-3772 5.5 MEDIUM Kernel: xfrm: null pointer dereference in xfrm_update_ae_params()
CVE-2023-3637 4.3 MEDIUM Openstack-neutron: unrestricted creation of security groups (fix for cve-2022-3277)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 9
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2023-3773

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