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debianDebianDEBIAN:DLA-2713-1:19730
HistoryJul 20, 2021 - 7:51 p.m.

[SECURITY] [DLA 2713-1] linux security update

2021-07-2019:51:07
lists.debian.org
79

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

AI Score

Confidence

High

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.002 Low

EPSS

Percentile

54.9%


Debian LTS Advisory DLA-2713-1 [email protected]
https://www.debian.org/lts/security/ Ben Hutchings
July 20, 2021 https://wiki.debian.org/LTS

Package : linux
Version : 4.9.272-2
CVE ID : CVE-2021-3609 CVE-2021-21781 CVE-2021-33909 CVE-2021-34693
Debian Bug : 990072

Brief introduction

CVE-2021-3609

Norbert Slusarek reported a race condition vulnerability in the CAN
BCM networking protocol, allowing a local attacker to escalate
privileges.

CVE-2021-21781

"Lilith >_>" of Cisco Talos discovered that the Arm initialisation
code does not fully initialise the "sigpage" that is mapped into
user-space processes to support signal handling.  This could
result in leaking sensitive information, particularly when the
system is rebooted.

CVE-2021-33909

The Qualys Research Labs discovered a size_t-to-int conversion
vulnerability in the Linux kernel's filesystem layer. An
unprivileged local attacker able to create, mount, and then delete a
deep directory structure whose total path length exceeds 1GB, can
take advantage of this flaw for privilege escalation.

Details can be found in the Qualys advisory at
https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt

CVE-2021-34693

Norbert Slusarek discovered an information leak in the CAN BCM
networking protocol. A local attacker can take advantage of this
flaw to obtain sensitive information from kernel stack memory.

For Debian 9 stretch, these problems have been fixed in version
4.9.272-2.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/linux

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

–
Ben Hutchings - Debian developer, member of kernel, installer and LTS teams

OSVersionArchitecturePackageVersionFilename
Debian9alllinux< 4.9.272-2linux_4.9.272-2_all.deb

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

AI Score

Confidence

High

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.002 Low

EPSS

Percentile

54.9%