Debian LTS: Security Advisory for linux-4.9 (DLA-2242-1)

Published: 2020-06-11 03:00:11
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C

Summary:
The remote host is missing an update for the 'linux-4.9' Linux Distribution Package(s) announced via the DLA-2242-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2019-2182 Hanjun Guo and Lei Li reported a race condition in the arm64 virtual memory management code, which could lead to an information disclosure, denial of service (crash), or possibly privilege escalation. CVE-2019-5108 Mitchell Frank of Cisco discovered that when the IEEE 802.11 (WiFi) stack was used in AP mode with roaming, it would trigger roaming for a newly associated station before the station was authenticated. An attacker within range of the AP could use this to cause a denial of service, either by filling up a switching table or by redirecting traffic away from other stations. CVE-2019-19319 Jungyeon discovered that a crafted filesystem can cause the ext4 implementation to deallocate or reallocate journal blocks. A user permitted to mount filesystems could use this to cause a denial of service (crash), or possibly for privilege escalation. CVE-2019-19462 The syzbot tool found a missing error check in the 'relay' library used to implement various files under debugfs. A local user permitted to access debugfs could use this to cause a denial of service (crash) or possibly for privilege escalation. CVE-2019-19768 Tristan Madani reported a race condition in the blktrace debug facility that could result in a use-after-free. A local user able to trigger removal of block devices could possibly use this to cause a denial of service (crash) or for privilege escalation. CVE-2019-20806 A potential null pointer dereference was discovered in the tw5864 media driver. The security impact of this is unclear. CVE-2019-20811 The Hulk Robot tool found a reference-counting bug in an error path in the network subsystem. The security impact of this is unclear. CVE-2020-0543 Researchers at VU Amsterdam discovered that on some Intel CPUs supporting the RDRAND and RDSEED instructions, part of a random value generated by these instructions may be used in a later speculative execution on any core of the same physical CPU. Depending on how these instructions are used by applications, a local user or VM guest could use this to obtain sensitive information such as cryptographic keys from other users or VMs. This vulnerability can be mitigated by a microcode update, either as part of system firmware (BIOS) or through the intel-microcode Linux Distribution Package in Debian's non-free archive section. This kernel update only provides reporting of the vulnerability and the option to disable the mitigation if it is not needed. CVE-2020-2732 Paulo Bonzini discovered that the KVM implemen ... Description truncated. Please see the references for more information.

Affected Versions:
'linux-4.9' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', these problems have been fixed in version 4.9.210-1+deb9u1~deb8u1. This version also fixes some related bugs that do not have their own CVE IDs, and a regression in the macvlan driver introduced in the previous security update (bug #952660). We recommend that you upgrade your linux-4.9 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2019-19319
https://nvd.nist.gov/vuln/detail/CVE-2019-19462
https://nvd.nist.gov/vuln/detail/CVE-2019-19768
https://nvd.nist.gov/vuln/detail/CVE-2019-20806
https://nvd.nist.gov/vuln/detail/CVE-2019-20811
https://nvd.nist.gov/vuln/detail/CVE-2019-2182
https://nvd.nist.gov/vuln/detail/CVE-2019-5108
https://nvd.nist.gov/vuln/detail/CVE-2020-0543
https://nvd.nist.gov/vuln/detail/CVE-2020-10711
https://nvd.nist.gov/vuln/detail/CVE-2020-10732
https://nvd.nist.gov/vuln/detail/CVE-2020-10751
https://nvd.nist.gov/vuln/detail/CVE-2020-10757
https://nvd.nist.gov/vuln/detail/CVE-2020-10942
https://nvd.nist.gov/vuln/detail/CVE-2020-11494
https://nvd.nist.gov/vuln/detail/CVE-2020-11565
https://nvd.nist.gov/vuln/detail/CVE-2020-11608
https://nvd.nist.gov/vuln/detail/CVE-2020-11609
https://nvd.nist.gov/vuln/detail/CVE-2020-11668
https://nvd.nist.gov/vuln/detail/CVE-2020-12114
https://nvd.nist.gov/vuln/detail/CVE-2020-12464
https://nvd.nist.gov/vuln/detail/CVE-2020-12652
https://nvd.nist.gov/vuln/detail/CVE-2020-12653
https://nvd.nist.gov/vuln/detail/CVE-2020-12654
https://nvd.nist.gov/vuln/detail/CVE-2020-12770
https://nvd.nist.gov/vuln/detail/CVE-2020-13143
https://nvd.nist.gov/vuln/detail/CVE-2020-2732
https://nvd.nist.gov/vuln/detail/CVE-2020-8428
https://nvd.nist.gov/vuln/detail/CVE-2020-8647
https://nvd.nist.gov/vuln/detail/CVE-2020-8648
https://nvd.nist.gov/vuln/detail/CVE-2020-8649
https://nvd.nist.gov/vuln/detail/CVE-2020-9383

References:

https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
https://security-tracker.debian.org/tracker/DLA-2242-1
https://bugs.debian.org/952660

Severity
High
CVSS Score
7.2
Published
2020-06-11
Modified
2020-06-12
Category
Debian Local Security Checks

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