Debian LTS: Security Advisory for linux-4.19 (DLA-2557-1)

Published: 2021-02-14 04:00:31
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-2557-1 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-2020-27815 A flaw was reported in the JFS filesystem code allowing a local attacker with the ability to set extended attributes to cause a denial of service. CVE-2020-27825 Adam 'pi3' Zabrocki reported a use-after-free flaw in the ftrace ring buffer resizing logic due to a race condition, which could result in denial of service or information leak. CVE-2020-27830 Shisong Qin reported a NULL pointer dereference flaw in the Speakup screen reader core driver. CVE-2020-28374 David Disseldorp discovered that the LIO SCSI target implementation performed insufficient checking in certain XCOPY requests. An attacker with access to a LUN and knowledge of Unit Serial Number assignments can take advantage of this flaw to read and write to any LIO backstore, regardless of the SCSI transport settings. CVE-2020-29568 (XSA-349) Michael Kurth and Pawel Wieczorkiewicz reported that frontends can trigger OOM in backends by updating a watched path. CVE-2020-29569 (XSA-350) Olivier Benjamin and Pawel Wieczorkiewicz reported a use-after-free flaw which can be triggered by a block frontend in Linux blkback. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. CVE-2020-29660 Jann Horn reported a locking inconsistency issue in the tty subsystem which may allow a local attacker to mount a read-after-free attack against TIOCGSID. CVE-2020-29661 Jann Horn reported a locking issue in the tty subsystem which can result in a use-after-free. A local attacker can take advantage of this flaw for memory corruption or privilege escalation. CVE-2020-36158 A buffer overflow flaw was discovered in the mwifiex WiFi driver which could result in denial of service or the execution of arbitrary code via a long SSID value. CVE-2021-3347 It was discovered that PI futexes have a kernel stack use-after-free during fault handling. An unprivileged user could use this flaw to crash the kernel (resulting in denial of service) or for privilege escalation. CVE-2021-20177 A flaw was discovered in the Linux implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) can take advantage of this flaw to cause a kernel panic when inserting iptables rules.

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

Recommendations:
For Debian 9 stretch, these problems have been fixed in version 4.19.171-2~deb9u1. 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-2020-27815
https://nvd.nist.gov/vuln/detail/CVE-2020-27825
https://nvd.nist.gov/vuln/detail/CVE-2020-27830
https://nvd.nist.gov/vuln/detail/CVE-2020-28374
https://nvd.nist.gov/vuln/detail/CVE-2020-29568
https://nvd.nist.gov/vuln/detail/CVE-2020-29569
https://nvd.nist.gov/vuln/detail/CVE-2020-29660
https://nvd.nist.gov/vuln/detail/CVE-2020-29661
https://nvd.nist.gov/vuln/detail/CVE-2020-36158
https://nvd.nist.gov/vuln/detail/CVE-2021-20177
https://nvd.nist.gov/vuln/detail/CVE-2021-3347

References:

https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
https://security-tracker.debian.org/tracker/DLA-2557-1

https://bugs.debian.org/970736
https://bugs.debian.org/972345
https://bugs.debian.org/977048
https://bugs.debian.org/977615

Severity
High
CVSS Score
7.2
Published
2021-02-14
Modified
2021-02-15
Category
Debian Local Security Checks

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