Vulnerability CVE-2017-11742

Vulnerability Name:

CVE-2017-11742 (CCN-129950)

Assigned:

2017-07-15

Published:

2017-07-15

Updated:

2017-08-09

Summary:

The writeRandomBytes_RtlGenRandom function in xmlparse.c in libexpat in Expat 2.2.1 and 2.2.2 on Windows allows local users to gain privileges via a Trojan horse ADVAPI32.DLL in the current working directory because of an untrusted search path, aka DLL hijacking.

CVSS v3 Severity:

7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/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): Low 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)
7.3 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:

4.6 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

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-426

Vulnerability Consequences:

Gain Privileges

References:

Source: MITRE
Type: CNA
CVE-2017-11742

Source: BID
Type: Third Party Advisory, VDB Entry
100147

Source: CCN
Type: BID-100147
Libexpat Expat CVE-2017-11742 DLL Loading Remote Code Execution Vulnerability

Source: XF
Type: UNKNOWN
expat-cve201711742-priv-esc(129950)

Source: CCN
Type: libexpat GIT Repository
[2.2.{1,2}] Windows LoadLibrary DLL hijacking vulnerability (CVE-2017-11742) #82

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://github.com/libexpat/libexpat/issues/82

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2017-11742

Vulnerable Configuration:

Configuration 1:

cpe:/a:libexpat_project:libexpat:2.2.1:*:*:*:*:*:*:*

OR cpe:/a:libexpat_project:libexpat:2.2.2:*:*:*:*:*:*:*

AND

cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

Configuration CCN 1:

cpe:/a:libexpat_project:libexpat:2.2.1:*:*:*:*:*:*:*

OR cpe:/a:libexpat_project:libexpat:2.2.2:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.trusty:def:201711742000	V	CVE-2017-11742 on Ubuntu 14.04 LTS (trusty) - untriaged.	2017-07-30
oval:com.ubuntu.xenial:def:201711742000	V	CVE-2017-11742 on Ubuntu 16.04 LTS (xenial) - untriaged.	2017-07-30
oval:com.ubuntu.xenial:def:2017117420000000	V	CVE-2017-11742 on Ubuntu 16.04 LTS (xenial) - untriaged.	2017-07-30

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