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debianDebianDEBIAN:DLA-2801-1:25203
HistoryOct 30, 2021 - 6:16 p.m.

[SECURITY] [DLA 2801-1] cron security update

2021-10-3018:16:57
lists.debian.org
30

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.3 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

26.8%


Debian LTS Advisory DLA-2801-1 [email protected]
https://www.debian.org/lts/security/ Adrian Bunk
October 30, 2021 https://wiki.debian.org/LTS


Package : cron
Version : 3.0pl1-128+deb9u2
CVE ID : CVE-2017-9525 CVE-2019-9704 CVE-2019-9705 CVE-2019-9706
Debian Bug : 809167

Brief introduction

CVE-2017-9525

Fix group crontab to root escalation via postinst.

CVE-2019-9704

A very large crontab created by a user could crash the daemon.

CVE-2019-9705

Enforce maximum crontab line count of 10000 to prevent a malicious 
user from creating an excessivly large crontab.

CVE-2019-9706

Fix for possible DoS by use-after-free.

Additionally, a bypass of /etc/cron.{allow,deny} on failure to open has
been fixed. If these files exist, then they must be readable by the user
executing crontab(1). Users will now be denied by default if they aren't.

For Debian 9 stretch, these problems have been fixed in version
3.0pl1-128+deb9u2.

We recommend that you upgrade your cron packages.

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

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

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.3 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

26.8%