National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-12749 Detail

Current Description

dbus before 1.10.28, 1.12.x before 1.12.16, and 1.13.x before 1.13.12, as used in DBusServer in Canonical Upstart in Ubuntu 14.04 (and in some, less common, uses of dbus-daemon), allows cookie spoofing because of symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. (This only affects the DBUS_COOKIE_SHA1 authentication mechanism.) A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to read and write in unintended locations. In the worst case, this could result in the DBusServer reusing a cookie that is known to the malicious client, and treating that cookie as evidence that a subsequent client connection came from an attacker-chosen uid, allowing authentication bypass.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.1 HIGH
Vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N (V3 legend)
Impact Score: 5.2
Exploitability Score: 1.8


Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 3.6 LOW
Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:N) (V2 legend)
Impact Subscore: 4.9
Exploitability Subscore: 3.9


Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): None
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00059.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00092.html
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00026.html
http://www.openwall.com/lists/oss-security/2019/06/11/2 Mailing List Mitigation Third Party Advisory
http://www.securityfocus.com/bid/108751
https://access.redhat.com/errata/RHSA-2019:1726
https://lists.debian.org/debian-lts-announce/2019/06/msg00005.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V2CQF37O73VH2JDVX2ILX2KD2KLXLQOU/
https://seclists.org/bugtraq/2019/Jun/16
https://usn.ubuntu.com/4015-1/ Third Party Advisory
https://usn.ubuntu.com/4015-2/
https://www.debian.org/security/2019/dsa-4462

Technical Details

Vulnerability Type (View All)

  • Improper Authentication (CWE-287)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:freedesktop:dbus:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
1.10.28
 cpe:2.3:a:freedesktop:dbus:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
1.12.0
Up to (excluding)
1.12.16
 cpe:2.3:a:freedesktop:dbus:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
1.13.0
Up to (excluding)
1.13.12

Configuration 2 ( hide )
 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

12 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-12749
NVD Published Date:
06/11/2019
NVD Last Modified:
06/14/2019