GNU Bash up to 4.4-beta1 rbash 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.
6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in GNU Bash up to 4.4-beta1 and classified as critical. Affected by this issue is some unknown functionality of the component rbash. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2019-9924. Local access is required to approach this attack. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in GNU Bash up to 4.4-beta1. Affected by this issue is an unknown code of the component rbash. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

rbash in Bash before 4.4-beta2 did not prevent the shell user from modifying BASH_CMDS, thus allowing the user to execute any command with the permissions of the shell.

The bug was discovered 11/14/2018. The weakness was disclosed 03/22/2019 (Website). The advisory is available at lists.debian.org. This vulnerability is handled as CVE-2019-9924 since 03/22/2019. Local access is required to approach this attack. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 128 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176754 (Debian Security Update for bash (DLA 1726-1)).

Upgrading to version 4.4-beta2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 94398†). The entry VDB-95860 is pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Bash 4.4-beta2

Timelineinfo

11/17/2016 🔍
11/14/2018 +727 days 🔍
03/22/2019 +128 days 🔍
03/22/2019 +0 days 🔍
03/23/2019 +1 days 🔍
08/04/2023 +1595 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: USN-4058-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-9924 (🔍)
GCVE (CVE): GCVE-0-2019-9924
GCVE (VulDB): GCVE-100-132122
SecurityFocus: 94398 - GNU Bash CVE-2016-9401 Local Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 03/23/2019 09:38
Updated: 08/04/2023 15:05
Changes: 03/23/2019 09:38 (61), 05/19/2020 11:47 (5), 08/04/2023 15:05 (4)
Complete: 🔍
Cache ID: 216:404:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!