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Advisories

NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure

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severity
medium
date
Affecting

  • NetBSD >= 9.0, < 9.5

  • NetBSD >= 10.0, <= 10.1

CWE
  • CWE-732 Incorrect Permission Assignment for Critical Resource
CVSS
6.8
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
Tristan CLERC
Description
NetBSD contains an information disclosure vulnerability in mm_open() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PK_KMEM process flag. Attackers can exploit this misconfigured flag to bypass the CANSEE_KPTR obfuscation mechanism and read kernel virtual addresses for sensitive kernel structures including struct proc, kauth_cred, filedesc, and vmspace via sysctl KERN_PROC queries.

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