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archlinuxArchLinuxASA-201906-16
HistoryJun 18, 2019 - 12:00 a.m.

[ASA-201906-16] dbus: access restriction bypass

2019-06-1800:00:00
security.archlinux.org
8

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

3.6 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.0005 Low

EPSS

Percentile

15.2%

Arch Linux Security Advisory ASA-201906-16

Severity: High
Date : 2019-06-18
CVE-ID : CVE-2019-12749
Package : dbus
Type : access restriction bypass
Remote : No
Link : https://security.archlinux.org/AVG-974

Summary

The package dbus before version 1.12.16-1 is vulnerable to access
restriction bypass.

Resolution

Upgrade to 1.12.16-1.

pacman -Syu “dbus>=1.12.16-1”

The problem has been fixed upstream in version 1.12.16.

Workaround

None.

Description

It has been discovered that dbus before 1.12.16 allows cookie spoofing
because of symlink mishandling in the reference implementation of
DBUS_COOKIE_SHA1 in the libdbus library. This issue 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.

Impact

A local attacker could use this issue to bypass authentication and
escalate privileges.

References

https://www.openwall.com/lists/oss-security/2019/06/11/2
https://gitlab.freedesktop.org/dbus/dbus/issues/269
https://gitlab.freedesktop.org/dbus/dbus/commit/47b1a4c41004bf494b87370987b222c934b19016
https://security.archlinux.org/CVE-2019-12749

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanydbus< 1.12.16-1UNKNOWN

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

3.6 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.0005 Low

EPSS

Percentile

15.2%

Related for ASA-201906-16