Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.0556
linux-4.19 security update
15 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux-4.19
Publisher: Debian
Operating System: Debian GNU/Linux
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Root Compromise -- Existing Account
Modify Arbitrary Files -- Remote with User Interaction
Denial of Service -- Existing Account
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20177 CVE-2021-3347 CVE-2020-36158
CVE-2020-29661 CVE-2020-29660 CVE-2020-29569
CVE-2020-29568 CVE-2020-28374 CVE-2020-27830
CVE-2020-27825 CVE-2020-27815
Reference: ESB-2021.0553
ESB-2021.0529
ESB-2021.0348
ESB-2021.0325
ESB-2021.0189.2
Original Bulletin:
https://www.debian.org/lts/security/2021/dla-2557
- --------------------------BEGIN INCLUDED TEXT--------------------
- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2557-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Ben Hutchings
February 12, 2021 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------
Package : linux-4.19
Version : 4.19.171-2~deb9u1
CVE ID : CVE-2020-27815 CVE-2020-27825 CVE-2020-27830 CVE-2020-28374
CVE-2020-29568 CVE-2020-29569 CVE-2020-29660 CVE-2020-29661
CVE-2020-36158 CVE-2021-3347 CVE-2021-20177
Debian Bug : 970736 972345 977048 977615
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.
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 packages.
For the detailed security status of linux-4.19 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/linux-4.19
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=/BA/
-----END PGP SIGNATURE-----