Debian LTS Advisory ([SECURITY] [DLA 1885-1] linux-4.9 security update)

Published: 2019-08-15 02:00:08
CVE Author: NIST National Vulnerability Database (NVD)

CVSS Base Vector:
AV:N/AC:M/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 DSA-1885-1 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-2017-18509 Denis Andzakovic reported a missing type check in the IPv4 multicast routing implementation. A user with the CAP_NET_ADMIN capability (in any user namespace) could use this for denial-of-service (memory corruption or crash) or possibly for privilege escalation. CVE-2018-5995 ADLab of VenusTech discovered that the kernel logged the virtual addresses assigned to per-CPU data, which could make it easier to exploit other vulnerabilities. CVE-2018-20836 chenxiang reported a race condition in libsas, the kernel subsystem supporting Serial Attached SCSI (SAS) devices, which could lead to a use-after-free. It is not clear how this might be exploited. CVE-2018-20856 Xiao Jin reported a potential double-free in the block subsystem, in case an error occurs while initialising the I/O scheduler for a block device. It is not clear how this might be exploited. CVE-2019-1125 It was discovered that most x86 processors could speculatively skip a conditional SWAPGS instruction used when entering the kernel from user mode, and/or could speculatively execute it when it should be skipped. This is a subtype of Spectre variant 1, which could allow local users to obtain sensitive information from the kernel or other processes. It has been mitigated by using memory barriers to limit speculative execution. Systems using an i386 kernel are not affected as the kernel does not use SWAPGS. CVE-2019-3882 It was found that the vfio implementation did not limit the number of DMA mappings to device memory. A local user granted ownership of a vfio device could use this to cause a denial of service (out-of-memory condition). CVE-2019-3900 It was discovered that vhost drivers did not properly control the amount of work done to service requests from guest VMs. A malicious guest could use this to cause a denial-of-service (unbounded CPU usage) on the host. CVE-2019-10207 The syzkaller tool found a potential null dereference in various drivers for UART-attached Bluetooth adapters. A local user with access to a pty device or other suitable tty device could use this for denial-of-service (BUG/oops). CVE-2019-10638 Amit Klein and Benny Pinkas discovered that the generation of IP packet IDs used a weak hash function, 'jhash'. This could enable tracking individual computers as they communicate with different remote servers and from different networks. The 'siphash' function is now used instead. CVE-2019-10639 Amit Klein and Benny Pinkas discovered that the generation of IP packet ... 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 4.9.168-1+deb9u5~deb8u1. 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-2017-18509
https://nvd.nist.gov/vuln/detail/CVE-2018-20836
https://nvd.nist.gov/vuln/detail/CVE-2018-20856
https://nvd.nist.gov/vuln/detail/CVE-2018-5995
https://nvd.nist.gov/vuln/detail/CVE-2019-10207
https://nvd.nist.gov/vuln/detail/CVE-2019-10638
https://nvd.nist.gov/vuln/detail/CVE-2019-10639
https://nvd.nist.gov/vuln/detail/CVE-2019-1125
https://nvd.nist.gov/vuln/detail/CVE-2019-13631
https://nvd.nist.gov/vuln/detail/CVE-2019-13648
https://nvd.nist.gov/vuln/detail/CVE-2019-14283
https://nvd.nist.gov/vuln/detail/CVE-2019-14284
https://nvd.nist.gov/vuln/detail/CVE-2019-3882
https://nvd.nist.gov/vuln/detail/CVE-2019-3900

References:

https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
https://security-tracker.debian.org/tracker/DLA-1885-1

Search
Severity
High
CVSS Score
9.3

You never have to pay for a vulnerability scanning and management software again.

Tired of paying a subscription 'per asset' or 'per IP'? Well you can officially cancel your current subscription. Mageni provides a free, open source and enterprise-ready vulnerability scanning and management platform which helps you to find, prioritize, remediate and manage your vulnerabilities. It is free and always will be.