Debian LTS: Security Advisory for linux-4.19 (DLA-2385-1)

Published: 2020-09-29 03:00:40
CVE Author: NIST National Vulnerability Database

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-4.19' Linux Distribution Package(s) announced via the DLA-2385-1 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 leak. CVE-2019-3874 Kernel buffers allocated by the SCTP network protocol were not limited by the memory cgroup controller. A local user could potentially use this to evade container memory limits and to cause a denial of service (excessive memory use). CVE-2019-19448, CVE-2019-19813, CVE-2019-19816 'Team bobfuzzer' reported bugs in Btrfs that could lead to a use-after-free or heap buffer overflow, and could be triggered by crafted filesystem images. A user permitted to mount and access arbitrary filesystems could use these to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2020-10781 Luca Bruno of Red Hat discovered that the zram control file /sys/class/zram-control/hot_add was readable by all users. On a system with zram enabled, a local user could use this to cause a denial of service (memory exhaustion). CVE-2020-12888 It was discovered that the PCIe Virtual Function I/O (vfio-pci) driver allowed users to disable a device's memory space while it was still mapped into a process. On some hardware platforms, local users or guest virtual machines permitted to access PCIe Virtual Functions could use this to cause a denial of service (hardware error and crash). CVE-2020-14314 A bug was discovered in the ext4 filesystem that could lead to an out-of-bound read. A local user permitted to mount and access arbitrary filesystem images could use this to cause a denial of service (crash). CVE-2020-14331 A bug was discovered in the VGA console driver's soft-scrollback feature that could lead to a heap buffer overflow. On a system with a custom kernel that has CONFIG_VGACON_SOFT_SCROLLBACK enabled, a local user with access to a console could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2020-14356 A bug was discovered in the cgroup subsystem's handling of socket references to cgroups. In some cgroup configurations, this could lead to a use-after-free. A local user might be able to use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2020-14385 A bug was discovered in XFS, which could lead to an extended attribute (xattr) wrongly being detected as invalid. A local user with access to an XFS filesystem could use this to cause a denial of service (filesystem shutdown). CVE-2020-14386 Or Cohen discovered a bug in the packet socket (AF_PACKET) implementation which could lead to a heap buffer overflow. A local ... Description truncated. Please see the references for more information.

Affected Versions:
'linux-4.19' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 9 stretch, these problems have been fixed in version 4.19.146-1~deb9u1. This update additionally fixes Debian bugs #966846, #966917, and #968567, and includes many more bug fixes from stable updates 4.19.133-4.19.146 inclusive. We recommend that you upgrade your linux-4.19 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-2019-19448
https://nvd.nist.gov/vuln/detail/CVE-2019-19813
https://nvd.nist.gov/vuln/detail/CVE-2019-19816
https://nvd.nist.gov/vuln/detail/CVE-2019-3874
https://nvd.nist.gov/vuln/detail/CVE-2020-10781
https://nvd.nist.gov/vuln/detail/CVE-2020-12888
https://nvd.nist.gov/vuln/detail/CVE-2020-14314
https://nvd.nist.gov/vuln/detail/CVE-2020-14331
https://nvd.nist.gov/vuln/detail/CVE-2020-14356
https://nvd.nist.gov/vuln/detail/CVE-2020-14385
https://nvd.nist.gov/vuln/detail/CVE-2020-14386
https://nvd.nist.gov/vuln/detail/CVE-2020-14390
https://nvd.nist.gov/vuln/detail/CVE-2020-16166
https://nvd.nist.gov/vuln/detail/CVE-2020-25212
https://nvd.nist.gov/vuln/detail/CVE-2020-25284
https://nvd.nist.gov/vuln/detail/CVE-2020-25285
https://nvd.nist.gov/vuln/detail/CVE-2020-25641
https://nvd.nist.gov/vuln/detail/CVE-2020-26088

References:

https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
https://security-tracker.debian.org/tracker/DLA-2385-1
https://bugs.debian.org/966846
https://bugs.debian.org/966917
https://bugs.debian.org/968567

Severity
High
CVSS Score
9.3
Published
2020-09-29
Modified
2020-09-30
Category
Debian Local Security Checks

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