Privilege escalation in Linux Kernel ptrace_link



Published: 2019-07-22 | Updated: 2019-10-23
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-13272
CWE ID CWE-264
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Advisory

Updated: 23.10.2019
Added link to a functional exploit, updated CVSS score to reflect the exploit availability.

1) Permissions, Privileges, and Access Controls

Severity: Low

CVSSv3: 7.2 [CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-13272

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Description

The vulnerability allows a local user to perform unauthorized actions on a targeted system.

The vulnerability exists when recording the credentials of a process that will create a ptrace relationship in the "ptrace_link" function in the "kernel/ptrace.c" file. A local authenticated user can create a specially crafted application and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.1.1, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.1.6, 5.1.7, 5.1.8, 5.1.9, 5.1.10, 5.1.11, 5.1.12, 5.1.13, 5.1.14, 5.1.15, 5.1.16

CPE External links

https://github.com/torvalds/linux/commit/6994eefb0053799d2e07cd140df6c2ea106c41ee
https://cdn.kernel.org/pub/linux/kernel/v5.x/
https://github.com/bcoles/kernel-exploits/tree/master/CVE-2019-13272
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/ptrace_trace...

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.