Vulnerability Name:

CVE-2017-9525 (CCN-127087)

Assigned:2017-06-09
Published:2017-06-09
Updated:2021-12-16
Summary:In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs.
CVSS v3 Severity:6.7 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
5.9 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.4 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:6.9 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
7.2 High (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-59
Vulnerability Consequences:Gain Privileges
References:Source: MISC
Type: Issue Tracking, Third Party Advisory, Vendor Advisory
http://bugs.debian.org/864466

Source: MITRE
Type: CNA
CVE-2017-9525

Source: CCN
Type: oss-sec Mailing List, Thu, 8 Jun 2017 20:05:34 +0200
Vixie/ISC Cron group crontab to root escalation

Source: MISC
Type: Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2017/06/08/3

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1038651

Source: XF
Type: UNKNOWN
cron-cve20179525-priv-esc(127087)

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20190321 [SECURITY] [DLA 1723-1] cron security update

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20211030 [SECURITY] [DLA 2801-1] cron security update

Source: CCN
Type: Debian Web iste
cron package

Source: CCN
Type: Ubuntu Web site
cron package

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cron_project:cron:*:*:*:*:*:*:*:* (Version <= 3.0pl1-128.)
  • AND
  • cpe:/o:debian:debian_linux:*:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.xenial:def:201795250000000
    V
    		CVE-2017-9525 on Ubuntu 16.04 LTS (xenial) - low.
    2017-06-09
    oval:com.ubuntu.artful:def:20179525000
    V
    		CVE-2017-9525 on Ubuntu 17.10 (artful) - low.
    2017-06-09
    oval:com.ubuntu.xenial:def:20179525000
    V
    		CVE-2017-9525 on Ubuntu 16.04 LTS (xenial) - low.
    2017-06-09
    oval:com.ubuntu.disco:def:201795250000000
    V
    		CVE-2017-9525 on Ubuntu 19.04 (disco) - low.
    2017-06-09
    oval:com.ubuntu.bionic:def:20179525000
    V
    		CVE-2017-9525 on Ubuntu 18.04 LTS (bionic) - low.
    2017-06-09
    oval:com.ubuntu.cosmic:def:201795250000000
    V
    		CVE-2017-9525 on Ubuntu 18.10 (cosmic) - low.
    2017-06-09
    oval:com.ubuntu.cosmic:def:20179525000
    V
    		CVE-2017-9525 on Ubuntu 18.10 (cosmic) - low.
    2017-06-09
    oval:com.ubuntu.bionic:def:201795250000000
    V
    		CVE-2017-9525 on Ubuntu 18.04 LTS (bionic) - low.
    2017-06-09
    oval:com.ubuntu.trusty:def:20179525000
    V
    		CVE-2017-9525 on Ubuntu 14.04 LTS (trusty) - low.
    2017-06-09
    BACK
    cron_project cron *
    debian debian linux *
    canonical ubuntu linux *
    debian debian linux 8.0
    debian debian linux 9.0