w3m up to 0.5.3 form.c formUpdateBuffer null pointer dereference

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.
6.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in w3m up to 0.5.3. Affected by this issue is the function formUpdateBuffer of the file form.c. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2018-6197. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in w3m up to 0.5.3 (Web Browser). This issue affects the function formUpdateBuffer of the file form.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

w3m through 0.5.3 is prone to a NULL pointer dereference flaw in formUpdateBuffer in form.c.

The bug was discovered 01/20/2018. The weakness was released 01/25/2018 (GitHub Repository). The advisory is shared at github.com. The identification of this vulnerability is CVE-2018-6197 since 01/24/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 106698 (Fedora 27 : w3m (2018-0ad6e73ac0)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172175 (SUSE Enterprise Linux Security Update for w3m (SUSE-SU-2019:0776-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106698) and SecurityFocus (BID 102846†). Entries connected to this vulnerability are available at VDB-112420 and VDB-112422. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 106698
Nessus Name: Fedora 27 : w3m (2018-0ad6e73ac0)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 57382
OpenVAS Name: Fedora Update for w3m FEDORA-2018-0ad6e73ac0
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: github.com

Timelineinfo

01/20/2018 🔍
01/24/2018 +4 days 🔍
01/24/2018 +0 days 🔍
01/25/2018 +1 days 🔍
01/25/2018 +0 days 🔍
01/26/2018 +0 days 🔍
02/08/2018 +13 days 🔍
02/09/2018 +1 days 🔍
02/02/2023 +1819 days 🔍

Sourcesinfo

Advisory: FEDORA-2018-0ad6e73ac0
Researcher: afl-fuzz
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-6197 (🔍)
GCVE (CVE): GCVE-0-2018-6197
GCVE (VulDB): GCVE-100-112421
SecurityFocus: 102846

See also: 🔍

Entryinfo

Created: 01/25/2018 14:59
Updated: 02/02/2023 15:59
Changes: 01/25/2018 14:59 (74), 12/27/2019 15:20 (4), 02/01/2021 16:23 (5), 02/02/2023 15:48 (4), 02/02/2023 15:54 (1), 02/02/2023 15:59 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!