Vulnerability Name:

CVE-2017-7358 (CCN-124794)

Assigned:2017-04-05
Published:2017-04-05
Updated:2017-08-16
Summary:In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows local attackers to own arbitrary directory path locations and escalate privileges to root when the guest user logs out.
CVSS v3 Severity:7.3 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H)
6.4 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): Required
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)
7.3 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:O/RC:C)
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-22
Vulnerability Consequences:Gain Privileges
References:Source: CCN
Type: Launchpad Web site
iewing all changes in revision 2478

Source: CONFIRM
Type: Third Party Advisory, VDB Entry
http://bazaar.launchpad.net/~lightdm-team/lightdm/trunk/revision/2478

Source: MITRE
Type: CNA
CVE-2017-7358

Source: CCN
Type: Full-Disclosure Mailing List, Tue, 18 Apr 2017 14:20:37 +0300
SSD Advisory – Ubuntu LightDM Guest Account Local Privilege Escalation

Source: BID
Type: Third Party Advisory, VDB Entry
97486

Source: CCN
Type: BID-97486
LightDM CVE-2017-7358 Local Directory Traversal Vulnerability

Source: XF
Type: UNKNOWN
lightdm-cve20177358-priv-esc(124794)

Source: CONFIRM
Type: Third Party Advisory, VDB Entry
https://launchpad.net/bugs/1677924

Source: CONFIRM
Type: Third Party Advisory, VDB Entry
https://lists.freedesktop.org/archives/lightdm/2017-April/001059.html

Source: EXPLOIT-DB
Type: UNKNOWN
41923

Source: CONFIRM
Type: Third Party Advisory
https://www.ubuntu.com/usn/usn-3255-1/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:lightdm_project:lightdm:*:*:*:*:*:*:*:* (Version <= 1.22.0)

    • Configuration 2:
  • cpe:/o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.precise:def:20177358000
    V
    		CVE-2017-7358 on Ubuntu 12.04 LTS (precise) - high.
    2017-04-05
    oval:com.ubuntu.trusty:def:20177358000
    V
    		CVE-2017-7358 on Ubuntu 14.04 LTS (trusty) - high.
    2017-04-05
    oval:com.ubuntu.xenial:def:20177358000
    V
    		CVE-2017-7358 on Ubuntu 16.04 LTS (xenial) - high.
    2017-04-05
    oval:com.ubuntu.xenial:def:201773580000000
    V
    		CVE-2017-7358 on Ubuntu 16.04 LTS (xenial) - high.
    2017-04-05
    BACK
    lightdm_project lightdm *
    canonical ubuntu linux 16.04
    canonical ubuntu linux 16.10