Description
libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.
Published: 2019-02-06
Score: 9.8 Critical
EPSS: 16.6% Moderate
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

No remediation available yet.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-1672-1 curl security update
Debian DSA Debian DSA DSA-4386-1 curl security update
Ubuntu USN Ubuntu USN USN-3882-1 curl vulnerabilities
History

Fri, 11 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.33935}

epss

{'score': 0.34384}


Subscriptions

Canonical Ubuntu Linux
Debian Debian Linux
Haxx Libcurl
Netapp Active Iq Unified Manager Clustered Data Ontap Oncommand Insight Oncommand Workflow Automation Snapcenter
Oracle Communications Operations Monitor Enterprise Manager Ops Center Http Server Mysql Server Secure Global Desktop Services Tools Bundle
Redhat Enterprise Linux Jboss Core Services
Siemens Sinema Remote Connect Client
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-04T19:19:18.599Z

Reserved: 2019-01-03T00:00:00.000Z

Link: CVE-2019-3822

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-02-06T20:29:00.353

Modified: 2024-11-21T04:42:36.923

Link: CVE-2019-3822

cve-icon Redhat

Severity : Moderate

Publid Date: 2019-02-06T00:00:00Z

Links: CVE-2019-3822 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses