Apache HTTP Server up to 2.4.38 HTTP/2 Request use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$5k-$25k0.00

Summaryinfo

A vulnerability described as critical has been identified in Apache HTTP Server. Impacted is an unknown function of the component HTTP2 Handler. Executing a manipulation as part of Request can lead to use after free. This vulnerability is tracked as CVE-2019-0196. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Apache HTTP Server (Web Server) and classified as critical. This vulnerability affects an unknown code block of the component HTTP2 Handler. The manipulation as part of a Request leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability. CVE summarizes:

A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2 request handling could be made to access freed memory in string comparison when determining the method of a request and thus process the request incorrectly.

The bug was discovered 04/01/2019. The weakness was disclosed 06/11/2019 (Website). The advisory is shared for download at httpd.apache.org. This vulnerability was named CVE-2019-0196 since 11/14/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 10/03/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 71 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176750 (Debian Security Update for apache2 (DSA 4422-1)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107666†). The entries VDB-103521, VDB-108939, VDB-115057 and VDB-115038 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/14/2018 🔍
04/01/2019 +138 days 🔍
04/01/2019 +0 days 🔍
06/11/2019 +71 days 🔍
06/12/2019 +1 days 🔍
10/03/2023 +1574 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: RHSA-2019:3932
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-0196 (🔍)
GCVE (CVE): GCVE-0-2019-0196
GCVE (VulDB): GCVE-100-136372
SecurityFocus: 107666 - Apache HTTP Server CVE-2019-0211 Local Privilege Escalation Vulnerability
OSVDB: - Apache HTTP Server mod_http2 module denial of service

See also: 🔍

Entryinfo

Created: 06/12/2019 10:54
Updated: 10/03/2023 15:17
Changes: 06/12/2019 10:54 (65), 06/22/2020 16:52 (3), 10/03/2023 15:17 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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