w3m up to 0.5.3 HTMLlineproc0 table.c feed_table_block_tag resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in w3m up to 0.5.3. Affected by this vulnerability is the function feed_table_block_tag of the file table.c of the component HTMLlineproc0. Executing a manipulation can lead to resource consumption. This vulnerability is registered as CVE-2018-6196. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in w3m up to 0.5.3 (Web Browser). This vulnerability affects the function feed_table_block_tag of the file table.c of the component HTMLlineproc0. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

w3m through 0.5.3 is prone to an infinite recursion flaw in HTMLlineproc0 because the feed_table_block_tag function in table.c does not prevent a negative indent value.

The bug was discovered 01/20/2018. The weakness was published 01/25/2018 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability was named CVE-2018-6196 since 01/24/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

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†). Similar entries are available at VDB-112421 and VDB-112422. Once again VulDB remains the best source for vulnerability data.

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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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-2018-6196 (🔍)
GCVE (CVE): GCVE-0-2018-6196
GCVE (VulDB): GCVE-100-112420
SecurityFocus: 102846

See also: 🔍

Entryinfo

Created: 01/25/2018 14:59
Updated: 02/02/2023 15:42
Changes: 01/25/2018 14:59 (75), 12/27/2019 15:16 (4), 02/01/2021 16:21 (5), 02/02/2023 15:37 (4), 02/02/2023 15:42 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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