CVE-2023-27538

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Summary

CVECVE-2023-27538
StatePUBLISHED
Assignerhackerone
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-03-30 20:15:07 UTC
Updated2026-10-14 23:17:16 UTC
DescriptionAn authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-305 | CWE-287 | CWE-305 Authentication Bypass by Primary Weakness (CWE-305)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1ADPDECLARED7.7HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.7HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Broadcom Brocade Fabric Operating System Firmware - All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Fedoraproject Fedora 36 All All All
Application Haxx Libcurl All All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp Clustered Data Ontap 9.0 - All All
Hardware Netapp H300s - All All All
Operating System Netapp H300s Firmware - All All All
Hardware Netapp H410s - All All All
Operating System Netapp H410s Firmware - All All All
Hardware Netapp H500s - All All All
Operating System Netapp H500s Firmware - All All All
Hardware Netapp H700s - All All All
Operating System Netapp H700s Firmware - All All All
Application Splunk Universal Forwarder All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Https//github.com/curl/curl affected Fixed in 8.0.0 Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
cert-portal.siemens.com/productcert/html/ssa-077170.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
March 2023 cURL/libcURL Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
[SECURITY] [DLA 3398-1] curl security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List
HackerOne af854a3a-2127-422b-91ae-364da2661108 hackerone.com Exploit, Third Party Advisory
curl: Multiple Vulnerabilities (GLSA 202310-12) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-943925.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
curl - SSH connection too eager reuse still - CVE-2023-27538 MITRE curl.se
[SECURITY] Fedora 36 Update: curl-7.82.0-14.fc36 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 161067 Oracle Enterprise Linux Security Update for curl (ELSA-2023-6679)
  • 181748 Debian Security Update for curl (DLA 3398-1)
  • 184522 Debian Security Update for curl (CVE-2023-27538)
  • 199246 Ubuntu Security Notification for curl Vulnerabilities (USN-5964-1)
  • 242295 Red Hat Update for curl (RHSA-2023:6679)
  • 283820 Fedora Security Update for curl (FEDORA-2023-2884ba1528)
  • 283865 Fedora Security Update for curl (FEDORA-2023-7e7414e64d)
  • 284222 Fedora Security Update for curl (FEDORA-2023-0de03a9232)
  • 330140 IBM AIX Multiple Vulnerabilities due to curl (curl_advisory2)
  • 355390 Amazon Linux Security Advisory for curl : ALAS2-2023-2070
  • 355415 Amazon Linux Security Advisory for curl : ALAS2023-2023-193
  • 378599 Splunk Enterprise Third Party Package Updates for June (SVD-2023-0613)
  • 378883 Splunk Enterprise August Third Party Package Updates (SVD-2023-0808)
  • 502707 Alpine Linux Security Update for curl
  • 502720 Alpine Linux Security Update for curl
  • 503104 Alpine Linux Security Update for curl
  • 505862 Alpine Linux Security Update for curl
  • 672889 EulerOS Security Update for curl (EulerOS-SA-2023-1816)
  • 672907 EulerOS Security Update for curl (EulerOS-SA-2023-1798)
  • 673091 EulerOS Security Update for curl (EulerOS-SA-2023-2188)
  • 673174 EulerOS Security Update for curl (EulerOS-SA-2023-2308)
  • 673187 EulerOS Security Update for curl (EulerOS-SA-2023-2328)
  • 673616 EulerOS Security Update for curl (EulerOS-SA-2023-2635)
  • 673678 EulerOS Security Update for curl (EulerOS-SA-2023-2677)
  • 691088 Free Berkeley Software Distribution (FreeBSD) Security Update for curl (0d7d104c-c6fb-11ed-8a4b-080027f5fec9)
  • 710772 Gentoo Linux curl Multiple Vulnerabilities (GLSA 202310-12)
  • 753819 SUSE Enterprise Linux Security Update for curl (SUSE-SU-2023:0865-1)
  • 753857 SUSE Enterprise Linux Security Update for curl (SUSE-SU-2023:1711-1)
  • 754020 SUSE Enterprise Linux Security Update for curl (SUSE-SU-2023:2226-1)
  • 754021 SUSE Enterprise Linux Security Update for curl (SUSE-SU-2023:2228-1)
  • 906768 Common Base Linux Mariner (CBL-Mariner) Security Update for curl (25848-1)
  • 907361 Common Base Linux Mariner (CBL-Mariner) Security Update for rust (25808-1)
  • 907651 Common Base Linux Mariner (CBL-Mariner) Security Update for mysql (25803-1)
  • 941357 AlmaLinux Security Update for curl (ALSA-2023:6679)

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