VDB-123019 · CVE-2018-15504 · GCVE-0-2018-15504

EmbedThis GoAhead/Appweb HTTP Request 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.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in EmbedThis GoAhead and Appweb. The affected element is an unknown function of the component HTTP Request Handler. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2018-15504. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in EmbedThis GoAhead and Appweb. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component HTTP Request Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. The server mishandles some HTTP request fields associated with time, which results in a NULL pointer dereference, as demonstrated by If-Modified-Since or If-Unmodified-Since with a month greater than 11.

The bug was discovered 02/05/2018. The weakness was shared 08/18/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-15504 since 08/17/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 193 days. During that time the estimated underground price was around $0-$5k.

Upgrading eliminates this vulnerability.

The entry VDB-123020 is related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

EmbedThis GoAhead up to 4.0.0
EmbedThis Appweb up to 7.0.1

Productinfo

Vendor

EmbedThis

Name

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

02/05/2018 🔍
08/17/2018 +192 days 🔍
08/17/2018 +0 days 🔍
08/18/2018 +1 days 🔍
08/18/2018 +0 days 🔍
05/02/2023 +1718 days 🔍

Sourcesinfo

Advisory: 66067ae6d1fa08b37a270e7dc1821df52ed2daef
Status: Not defined

CVE: CVE-2018-15504 (🔍)
GCVE (CVE): GCVE-0-2018-15504
GCVE (VulDB): GCVE-100-123019
See also: 🔍

Entryinfo

Created: 08/18/2018 13:35
Updated: 05/02/2023 14:28
Changes: 08/18/2018 13:35 (58), 03/16/2020 15:29 (1), 05/02/2023 14:28 (5)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.