Vulnerability of Linux kernel: privilege escalation via ptrace_link

Synthesis of the vulnerability

An attacker can bypass restrictions via ptrace_link of the Linux kernel, in order to escalate his privileges.

Vulnerable products: Debian, Fedora, Android OS, Tivoli Storage Manager, Linux, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Severity of this weakness: 2/4.

Creation date: 18/07/2019.

Références of this bulletin: CERTFR-2019-AVI-375, CERTFR-2019-AVI-391, CERTFR-2019-AVI-419, CERTFR-2019-AVI-451, CERTFR-2019-AVI-561, CERTFR-2019-AVI-575, CVE-2019-13272, DLA-1862-1, DLA-1863-1, DSA-4484-1, FEDORA-2019-a95015e60f, PROJ-ZERO-1903, RHSA-2019:2405-01, RHSA-2019:2411-01, RHSA-2019:2809-01, SSA:2019-202-01, SSB-439005, SUSE-SU-2019:2949-1, SUSE-SU-2019:2984-1, USN-4093-1, USN-4094-1, USN-4095-1, USN-4095-2, USN-4117-1, USN-4118-1, VIGILANCE-VUL-29820.

Description of the vulnerability

An attacker can bypass restrictions via ptrace_link of the Linux kernel, in order to escalate his privileges.
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This computer threat impacts software or systems such as Debian, Fedora, Android OS, Tivoli Storage Manager, Linux, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability alert is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this cybersecurity weakness.

Solutions for this threat

Linux kernel: version 5.1.17.
The version 5.1.17 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.59.
The version 4.19.59 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.133.
The version 4.14.133 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.185.
The version 4.9.185 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.185.
The version 4.4.185 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.71.
The version 3.16.71 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for ptrace_link.
A patch is indicated in information sources.

Debian 8: new linux-4.9 packages.
New packages are available:
Debian 8: linux-4.9 4.9.168-1+deb9u4~deb8u1

Debian 8: new linux packages.
New packages are available:
Debian 8: linux 3.16.70-1

Debian 9/10: new linux packages.
New packages are available:
Debian 9: linux 4.9.168-1+deb9u4
Debian 10: linux 4.19.37-5+deb10u1

Fedora 29: new kernel-headers packages.
New packages are available:
Fedora 29: kernel-headers 5.1.18-200.fc29

Fedora 29: new kernel packages.
New packages are available:
Fedora 29: kernel 5.1.18-200.fc29

Google Android/Pixel: patch for March 2020.
A patch is indicated in information sources.

IBM Spectrum Protect Plus: version 10.1.4.222.
The version 10.1.4.222 is fixed:
http://www.ibm.com/support/docview.wss?uid=ibm10880861

RHEL 7: new kernel-alt packages.
New packages are available:
RHEL 7: kernel-alt 4.14.0-115.12.1.el7a

RHEL 8.0: new kernel packages.
New packages are available:
RHEL 8: kernel 4.18.0-80.7.2.el8_0

RHEL 8.0: new kernel-rt packages.
New packages are available:
RHEL 8: kernel-rt 4.18.0-80.7.2.rt9.154.el8_0

SIMATIC S7-1500 CPU 1518: workaround for GNU/Linux Vulnerabilities.
A workaround is indicated in the information source.

Slackware 14.2: new kernel packages.
New packages are available:
Slackware 14.2: linux 4.4.186

SUSE LE 12 SP2: new kernel packages.
New packages are available:
SUSE LE 12 SP2: kernel 4.4.121-92.125.1

SUSE LE 12 SP3: new kernel packages (13/11/2019).
New packages are available:
SUSE LE 12 SP3: kernel 4.4.180-94.107.1

Ubuntu 16/18: new linux-image-aws packages.
New packages are available:
Ubuntu 16.04 LTS: linux-image-aws 4.15.0.1047.47
Ubuntu 18.04 LTS: linux-image-aws 4.15.0.1047.46

Ubuntu 19.04: new linux-image-aws packages.
New packages are available:
Ubuntu 19.04: linux-image-aws 5.0.0.1014.15

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.58.79
Ubuntu 18.04 LTS: linux-image-generic 4.15.0.58.60

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.159.140
Ubuntu 16.04 LTS: linux-image-generic 4.4.0.159.167

Ubuntu: new linux-image-5.0.0 packages.
New packages are available:
Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.0.0.25.82
Ubuntu 19.04: linux-image-generic 5.0.0.25.26
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