CriticalCVE-2018-1000007

    Haxx Curl: security vulnerability (CVE-2018-1000007)

    Published Sources: OSV, CVE.org

    What is affected, what to do

    libcurl 7.1 through 7.57.0 might accidentally leak authentication data to third parties. When asked to send custom headers in its HTTP requests, libcurl will send that set of headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the `Location:` response header value.

    Update Fujitsu M10-1 Firmware to version xcp2361, Fujitsu M10-4 Firmware to version xcp2361, Fujitsu M10-4s Firmware to version xcp2361.

    Affected
    • Haxx Curl lte 7.1..7.57.0
    • Debian Linux eq 7.0..7.0
    • Debian Linux eq 8.0..8.0
    • Debian Linux eq 9.0..9.0
    • Canonical Ubuntu Linux eq 12.04..12.04
    • Canonical Ubuntu Linux eq 14.04..14.04
    • Canonical Ubuntu Linux eq 16.04..16.04
    • Canonical Ubuntu Linux eq 17.10..17.10
    • Redhat Enterprise Linux Desktop eq 7.0..7.0
    • Redhat Enterprise Linux Server eq 7.0..7.0
    • Redhat Enterprise Linux Server Advanced mission critical Update Support (AUS) eq 7.4..7.4
    • Redhat Enterprise Linux Server Extended Update Support (EUS) eq 7.4..7.4
    • Redhat Enterprise Linux Server Extended Update Support (EUS) eq 7.5..7.5
    • Redhat Enterprise Linux Workstation eq 7.0..7.0
    • Fujitsu M10-1 Firmware lt *..xcp2361
    • Fujitsu M10-4 Firmware lt *..xcp2361
    • Fujitsu M10-4s Firmware lt *..xcp2361
    • Fujitsu M12-1 Firmware lt *..xcp2361
    • Fujitsu M12-2 Firmware lt *..xcp2361
    • Fujitsu M12-2s Firmware lt *..xcp2361
    • Fujitsu M10-1 Firmware lt *..xcp3070
    • Fujitsu M10-4 Firmware lt *..xcp3070
    • Fujitsu M10-4s Firmware lt *..xcp3070
    • Fujitsu M12-1 Firmware lt *..xcp3070
    • Fujitsu M12-2 Firmware lt *..xcp3070
    • Fujitsu M12-2s Firmware lt *..xcp3070
    Fixed in
    • Fujitsu M10-1 Firmware xcp2361
    • Fujitsu M10-4 Firmware xcp2361
    • Fujitsu M10-4s Firmware xcp2361
    • Fujitsu M12-1 Firmware xcp2361
    • Fujitsu M12-2 Firmware xcp2361
    • Fujitsu M12-2s Firmware xcp2361
    • Fujitsu M10-1 Firmware xcp3070
    • Fujitsu M10-4 Firmware xcp3070
    • Fujitsu M10-4s Firmware xcp3070
    • Fujitsu M12-1 Firmware xcp3070
    • Fujitsu M12-2 Firmware xcp3070
    • Fujitsu M12-2s Firmware xcp3070

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    9.8

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    9.8

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: OSV, CVE.org

    9.9 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 95.6

    Show all metrics
    Severity
    Critical
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    122.04 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    9.8 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    9.8
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    9.9 %
    Moderate — model estimates 1-10% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    95.6
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    libcurl 7.1 through 7.57.0 might accidentally leak authentication data to third parties. When asked to send custom headers in its HTTP requests, libcurl will send that set of headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the `Location:` response header value. Sending the same set of headers to subsequent hosts is in particular a problem for applications that pass on custom `Authorization:` headers, as this header often contains privacy sensitive information or data that could allow others to impersonate the libcurl-using client's request.

    Source: OSV (Open Source Vulnerabilities), NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    haxxcurl
    • 7.1 – ≤ 7.57.0
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebiandebian_linux7.0
    Linuxdebiandebian_linux8.0
    Linuxdebiandebian_linux9.0
    Linuxredhatenterprise_linux_desktop7.0
    Linuxredhatenterprise_linux_server7.0
    Linuxredhatenterprise_linux_server_aus7.4
    Linuxredhatenterprise_linux_server_eus7.4
    Linuxredhatenterprise_linux_server_eus7.5
    Linuxredhatenterprise_linux_workstation7.0
    Linuxcanonicalubuntu_linux12.04
    Linuxcanonicalubuntu_linux14.04
    Linuxcanonicalubuntu_linux16.04
    Linuxcanonicalubuntu_linux17.10
    Otherfujitsum10-1_firmware—
    Otherfujitsum10-4_firmware—
    Otherfujitsum10-4s_firmware—
    Otherfujitsum12-1_firmware—
    Otherfujitsum12-2_firmware—
    Otherfujitsum12-2s_firmware—

    References & sources

    • usn.ubuntu.comUSN-3554-2Vendor advisory, x_refsource_UBUNTU, Third-party advisory
    • usn.ubuntu.comUSN-3554-1Vendor advisory, x_refsource_UBUNTU, Third-party advisory
    • access.redhat.comRHSA-2018:3558Vendor advisory, x_refsource_REDHAT, Third-party advisory
    • debian.orgDSA-4098Vendor advisory, x_refsource_DEBIAN, Third-party advisory
    • curl.haxx.sedocs/adv_2018-b3bf.htmlx_refsource_CONFIRM, Patch, Vendor advisory
    • securitytracker.com1040274Vulnerability database, x_refsource_SECTRACK, Third-party advisory, Vulnerability database
    • access.redhat.comRHSA-2018:3157Vendor advisory, x_refsource_REDHAT, Third-party advisory
    • lists.debian.org[debian-lts-announce] 20180129 [SECURITY] [DLA 1263-1] curl security updateMailing list, x_refsource_MLIST, Mailing list, Third-party advisory
    • access.redhat.comRHBA-2019:0327Vendor advisory, x_refsource_REDHAT, Third-party advisory
    • access.redhat.comRHSA-2019:1543Vendor advisory, x_refsource_REDHAT, Third-party advisory
    • oracle.comtechnetwork/security-advisory/cpuoct2019-5072832.htmlx_refsource_MISC, Patch, Third-party advisory
    • access.redhat.comRHSA-2020:0544Vendor advisory, x_refsource_REDHAT, Third-party advisory
    • access.redhat.comRHSA-2020:0594Vendor advisory, x_refsource_REDHAT, Third-party advisory
    • openwall.com[oss-security] 20220427 [SECURITY ADVISORY] curl auth/cookie leak on redirectMailing list, x_refsource_MLIST, Mailing list, Third-party advisory
    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2018-1000007
    <a href="https://intel.neosec.eu/en/cve/CVE-2018-1000007"><img src="https://intel.neosec.eu/badge/cve/CVE-2018-1000007.svg?lang=en" alt="CVE-2018-1000007 – NEOSEC Intel" height="20"></a>