Vulnerability CVE-2017-12871

Vulnerability Name:

CVE-2017-12871 (CCN-131392)

Assigned:

2016-03-29

Published:

2016-03-29

Updated:

2017-09-06

Summary:

The aesEncrypt method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.x through 1.14.11 makes it easier for context-dependent attackers to bypass the encryption protection mechanism by leveraging use of the first 16 bytes of the secret key as the initialization vector (IV).

CVSS v3 Severity:

5.9 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
5.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): None Availibility (A): None

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): Low Availibility (A): None

CVSS v2 Severity:

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

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

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

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

Vulnerability Type:

CWE-326

Vulnerability Consequences:

Bypass Security

References:

Source: MITRE
Type: CNA
CVE-2017-12871

Source: XF
Type: UNKNOWN
simplesamlphp-cve201712871-sec-bypass(131392)

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://github.com/simplesamlphp/simplesamlphp/commit/77df6a932d46daa35e364925eb73a175010dc904

Source: CCN
Type: SimpleSAMLphp Web site
Incorrect IV generation for encryption

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://simplesamlphp.org/security/201703-02

Vulnerable Configuration:

Configuration 1:

cpe:/a:simplesamlphp:simplesamlphp:1.14.0:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.1:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.2:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.3:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.4:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.5:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.6:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.7:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.8:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.9:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.10:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.11:*:*:*:*:*:*:*

Configuration CCN 1:

cpe:/a:simplesamlphp:simplesamlphp:1.14.0:*:*:*:*:*:*:*

OR cpe:/a:simplesamlphp:simplesamlphp:1.14.11:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.xenial:def:2017128710000000	V	CVE-2017-12871 on Ubuntu 16.04 LTS (xenial) - medium.	2017-09-01
oval:com.ubuntu.artful:def:201712871000	V	CVE-2017-12871 on Ubuntu 17.10 (artful) - untriaged.	2017-09-01
oval:com.ubuntu.xenial:def:201712871000	V	CVE-2017-12871 on Ubuntu 16.04 LTS (xenial) - medium.	2017-09-01
oval:com.ubuntu.disco:def:2017128710000000	V	CVE-2017-12871 on Ubuntu 19.04 (disco) - medium.	2017-09-01
oval:com.ubuntu.bionic:def:201712871000	V	CVE-2017-12871 on Ubuntu 18.04 LTS (bionic) - medium.	2017-09-01
oval:com.ubuntu.cosmic:def:2017128710000000	V	CVE-2017-12871 on Ubuntu 18.10 (cosmic) - medium.	2017-09-01
oval:com.ubuntu.cosmic:def:201712871000	V	CVE-2017-12871 on Ubuntu 18.10 (cosmic) - medium.	2017-09-01
oval:com.ubuntu.bionic:def:2017128710000000	V	CVE-2017-12871 on Ubuntu 18.04 LTS (bionic) - medium.	2017-09-01
oval:com.ubuntu.trusty:def:201712871000	V	CVE-2017-12871 on Ubuntu 14.04 LTS (trusty) - medium.	2017-09-01

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