Bug 690068 (CVE-2019-13272)

Summary:	kernel: ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process
Product:	Gentoo Security	Reporter:	D'juan McDonald (domhnall) <flopwiki>
Component:	Kernel	Assignee:	Gentoo Kernel Security <security-kernel>
Status:	RESOLVED FIXED
Severity:	critical	CC:	hydrapolic, kernel
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://bugzilla.suse.com/show_bug.cgi?id=1140671
Whiteboard:	A1 [stable?]
Package list:		Runtime testing required:	---

Description D'juan McDonald (domhnall) 2019-07-17 16:38:23 UTC

(https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-13272):

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. 


Gentoo Security Padawan
(domhnall)

Comment 1 Michael 'veremitz' Everitt 2019-07-31 13:11:45 UTC

Fixed in kernel releases:

[From IRC]:
 <gregkh> 4.4.185 4.9.185 4.14.133 4.19.58 5.1.17 5.2

gentoo-sources as above.

Genpatches:
- 4.4.186
- 4.9.186
- 4.14.142
- 4.19.59
- 5.1.17

Comment 2 John Helmert III archtester

2022-03-26 01:03:10 UTC

(In reply to Michael 'veremitz' Everitt from comment #1)
> Fixed in kernel releases:
> 
> [From IRC]:
>  <gregkh> 4.4.185 4.9.185 4.14.133 4.19.58 5.1.17 5.2
> 
> gentoo-sources as above.
> 
> Genpatches:
> - 4.4.186
> - 4.9.186
> - 4.14.142
> - 4.19.59
> - 5.1.17

Vulnerable versions long gone