BusyBox up to 1.22.x Kernel Module Loader modutils/modprobe.c add_probe Name input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.2	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in BusyBox up to 1.22.x. This issue affects the function add_probe of the file modutils/modprobe.c of the component Kernel Module Loader. The manipulation of the argument Name results in input validation. This vulnerability is known as CVE-2014-9645. Attacking locally is a requirement. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in BusyBox up to 1.22.x. Affected is the function add_probe of the file modutils/modprobe.c of the component Kernel Module Loader. The manipulation of the argument name with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The add_probe function in modutils/modprobe.c in BusyBox before 1.23.0 allows local users to bypass intended restrictions on loading kernel modules via a / (slash) character in a module name, as demonstrated by an "ifconfig /usbserial up" command or a "mount -t /snd_pcm none /" command.

The bug was discovered 01/25/2015. The weakness was published 03/12/2017 by Matt (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is traded as CVE-2014-9645 since 01/24/2015. The attack needs to be approached locally. The successful exploitation requires a authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 187 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 85720 (SUSE SLED12 / SLES12 Security Update : busybox (SUSE-SU-2015:1445-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197418 (Ubuntu Security Notification for Busybox Vulnerabilities (USN-3935-1)).

Upgrading to version 1.23.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.busybox.net. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published even before and not after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if (strchr(name, '/'))
   bb_error_msg_and_die("malformed module name '%s'", name);

The vulnerability is also documented in the databases at Tenable (85720) and SecurityFocus (BID 72324†). Similar entries are available at VDB-96755, VDB-96756, VDB-104922 and VDB-108612. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• BusyBox

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 85720
Nessus Name: SUSE SLED12 / SLES12 Security Update : busybox (SUSE-SU-2015:1445-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 861575
OpenVAS Name: Gentoo Linux Local Check: https://security.gentoo.org/glsa/201503-13
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: BusyBox 1.23.0
Patch: git.busybox.net

Timelineinfo

01/24/2015 🔍
01/25/2015 +1 days 🔍
01/27/2015 +2 days 🔍
07/31/2015 +185 days 🔍
09/01/2015 +32 days 🔍
03/12/2017 +558 days 🔍
03/12/2017 +0 days 🔍
03/12/2017 +0 days 🔍
09/06/2020 +1274 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Matt
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-9645 (🔍)
GCVE (CVE): GCVE-0-2014-9645
GCVE (VulDB): GCVE-100-97860
SecurityFocus: 72324 - BusyBox CVE-2014-9645 Local Security Bypass Vulnerability
OSVDB: - CVE-2014-9645 - BusyBox - Security Bypass Issue

See also: 🔍

Entryinfo

Created: 03/12/2017 17:09
Updated: 09/06/2020 09:14
Changes: 03/12/2017 17:09 (81), 09/06/2020 09:14 (6)
Complete: 🔍
Cache ID: 216:FF5:103

Once again VulDB remains the best source for vulnerability data.

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