Debian LTS: Security Advisory for linux-4.19 (DLA-2610-1)

Published: 2021-03-31 03:00:27
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-4.19' Linux Distribution Package(s) announced via the DLA-2610-1 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 the execution of arbitrary code, privilege escalation, denial of service, or information leaks. CVE-2020-27170, CVE-2020-27171 Piotr Krysiuk discovered flaws in the BPF subsystem's checks for information leaks through speculative execution. A local user could use these to obtain sensitive information from kernel memory. CVE-2021-3348 ADlab of venustech discovered a race condition in the nbd block driver that can lead to a use-after-free. A local user with access to an nbd block device could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2021-3428 Wolfgang Frisch reported a potential integer overflow in the ext4 filesystem driver. A user permitted to mount arbitrary filesystem images could use this to cause a denial of service (crash). CVE-2021-26930 (XSA-365) Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Sch?nherr discovered that the Xen block backend driver (xen-blkback) did not handle grant mapping errors correctly. A malicious guest could exploit this bug to cause a denial of service (crash), or possibly an information leak or privilege escalation, within the domain running the backend, which is typically dom0. CVE-2021-26931 (XSA-362), CVE-2021-26932 (XSA-361), CVE-2021-28038 (XSA-367) Jan Beulich discovered that the Xen support code and various Xen backend drivers did not handle grant mapping errors correctly. A malicious guest could exploit these bugs to cause a denial of service (crash) within the domain running the backend, which is typically dom0. CVE-2021-27363 Adam Nichols reported that the iSCSI initiator subsystem did not properly restrict access to transport handle attributes in sysfs. On a system acting as an iSCSI initiator, this is an information leak to local users and makes it easier to exploit CVE-2021-27364. CVE-2021-27364 Adam Nichols reported that the iSCSI initiator subsystem did not properly restrict access to its netlink management interface. On a system acting as an iSCSI initiator, a local user could use these to cause a denial of service (disconnection of storage) or possibly for privilege escalation. CVE-2021-27365 Adam Nichols reported that the iSCSI initiator subsystem did not correctly limit the lengths of parameters or 'passthrough PDUs' sent through its netlink management interface. On a system acting as an iSCSI initiator, a local user could use these to leak the contents of kernel memory, to cause a denial of service (kernel memory corruption or crash), and probably for privilege escalation. CVE-2021-286 ... 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 4.19.181-1~deb9u1. This update additionally fixes Debian bug #983595, and includes many more bug fixes from stable updates 4.19.172-4.19.181 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-2020-27170
https://nvd.nist.gov/vuln/detail/CVE-2020-27171
https://nvd.nist.gov/vuln/detail/CVE-2021-26930
https://nvd.nist.gov/vuln/detail/CVE-2021-26931
https://nvd.nist.gov/vuln/detail/CVE-2021-26932
https://nvd.nist.gov/vuln/detail/CVE-2021-27363
https://nvd.nist.gov/vuln/detail/CVE-2021-27364
https://nvd.nist.gov/vuln/detail/CVE-2021-27365
https://nvd.nist.gov/vuln/detail/CVE-2021-28038
https://nvd.nist.gov/vuln/detail/CVE-2021-28660
https://nvd.nist.gov/vuln/detail/CVE-2021-3348
https://nvd.nist.gov/vuln/detail/CVE-2021-3428

References:

https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
https://security-tracker.debian.org/tracker/DLA-2610-1

https://bugs.debian.org/983595

Severity
High
CVSS Score
7.2
Published
2021-03-31
Modified
2021-03-31
Category
Debian Local Security Checks

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