Improper Privilege Management Affecting linux-4.9 package, versions <4.9.168-1+deb9u4~deb8u1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

Exploit Maturity
Attacked
EPSS
0.32% (71st percentile)

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  • Snyk IDSNYK-DEBIAN8-LINUX49-452403
  • published24 Jul 2019
  • disclosed17 Jul 2019

Introduced: 17 Jul 2019

CVE-2019-13272  (opens in a new tab)
CWE-269  (opens in a new tab)

How to fix?

Upgrade Debian:8 linux-4.9 to version 4.9.168-1+deb9u4~deb8u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-4.9 package and not the linux-4.9 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to create a ptrace relationship, which allows local users to obtain root access by leveraging certain scenarios with a parent-child process relationship, where a parent drops privileges and calls execve (potentially allowing control by an attacker). One contributing factor is an object lifetime issue (which can also cause a panic). Another contributing factor is incorrect marking of a ptrace relationship as privileged, which is exploitable through (for example) Polkit's pkexec helper with PTRACE_TRACEME. NOTE: SELinux deny_ptrace might be a usable workaround in some environments.

References

CVSS Base Scores

version 3.1