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CVE-2019-3822

HIGH
Published 2019-02-06T20:00:00
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CVSS Score

V3.0
7.1
/10
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.339
probability
of exploitation in the wild

There is a 33.9% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.967
Higher than 96.7% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
LOW
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

The curl Project

curl

Affected Versions:

7.64.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed CRITICAL

GHSA-8wr2-mqj7-7vxp

Advisory Details

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.

CVSS Scoring

CVSS Score

9.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2019-3822
WEB https://access.redhat.com/errata/RHSA-2019:3701
WEB https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3822
WEB https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
WEB https://curl.haxx.se/docs/CVE-2019-3822.html
WEB https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f@%3Cdevnull.infra.apache.org%3E
WEB https://security.gentoo.org/glsa/201903-03
WEB https://security.netapp.com/advisory/ntap-20190315-0001
WEB https://security.netapp.com/advisory/ntap-20190719-0004
WEB https://support.f5.com/csp/article/K84141449
WEB https://support.f5.com/csp/article/K84141449?utm_source=f5support&utm_medium=RSS
WEB https://usn.ubuntu.com/3882-1
WEB https://www.debian.org/security/2019/dsa-4386
WEB https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
WEB https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
WEB http://www.securityfocus.com/bid/106950

Advisory provided by GitHub Security Advisory Database. Published: May 13, 2022, Modified: May 13, 2022

References

https://security.gentoo.org/glsa/201903-03
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3822
https://www.debian.org/security/2019/dsa-4386
https://curl.haxx.se/docs/CVE-2019-3822.html
https://security.netapp.com/advisory/ntap-20190315-0001/
https://usn.ubuntu.com/3882-1/
http://www.securityfocus.com/bid/106950
https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
https://security.netapp.com/advisory/ntap-20190719-0004/
https://support.f5.com/csp/article/K84141449
https://support.f5.com/csp/article/K84141449?utm_source=f5support&amp%3Butm_medium=RSS
https://access.redhat.com/errata/RHSA-2019:3701
Published: 2019-02-06T20:00:00
Last Modified: 2024-08-04T19:19:18.599Z
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