VDB-144102 · CVE-2019-18277 · USN-4174-1

HAProxy up to 2.0.5 Legacy Mode HTTP Request 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.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical was found in HAProxy up to 2.0.5. This affects an unknown part of the component Legacy Mode. The manipulation as part of HTTP Request results in input validation. This vulnerability is reported as CVE-2019-18277. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in HAProxy up to 2.0.5 (Firewall Software). Affected is an unknown function of the component Legacy Mode. The manipulation as part of a HTTP Request leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).

The weakness was disclosed 10/23/2019. This vulnerability is traded as CVE-2019-18277 since 10/23/2019. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

Upgrading to version 2.0.6 eliminates this vulnerability.

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Productinfo

Type

Firewall Software

Name

HAProxy

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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: Input validation
CWE: CWE-20
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: 🔍

Upgrade: HAProxy 2.0.6
Patch: 196a7df44d8129d1adc795da020b722614d6a581

Timelineinfo

10/23/2019 🔍
10/23/2019 +0 days 🔍
10/24/2019 +1 days 🔍
01/27/2024 +1556 days 🔍

Sourcesinfo

Advisory: USN-4174-1
Status: Not defined

CVE: CVE-2019-18277 (🔍)
GCVE (CVE): GCVE-0-2019-18277
GCVE (VulDB): GCVE-100-144102

Entryinfo

Created: 10/24/2019 12:42
Updated: 01/27/2024 08:13
Changes: 10/24/2019 12:42 (37), 10/24/2019 12:47 (18), 01/27/2024 08:13 (7)
Complete: 🔍
Cache ID: 216::103