HighCVE-2022-42915

    Haxx Curl: Double Free (CVE-2022-42915)

    Published Last modified Sources: BSI, Siemens ProductCERT, CVE.org, OSV

    What is affected, what to do

    curl before 7.86.0 has a double free. If curl is told to use an HTTP proxy for a transfer with a non-HTTP(S) URL, it sets up the connection to the remote server by issuing a CONNECT request to the proxy, and then tunnels the rest of the protocol through.

    Update Haxx Curl to version 7.86.0, Apple macOS to version 12.6.3, Apple macOS to version 13.2.

    Affected
    • Haxx Curl lt 7.77.0..7.86.0
    • Fedora eq 35..35
    • Fedora eq 36..36
    • Fedora eq 37..37
    • Apple macOS lt 12.0.0..12.6.3
    • Apple macOS lt 13.0..13.2
    • Splunk Universal Forwarder lt 8.2.0..8.2.12
    • Splunk Universal Forwarder lt 9.0.0..9.0.6
    • Splunk Universal Forwarder eq 9.1.0..9.1.0
    Fixed in
    • Haxx Curl 7.86.0
    • Apple macOS 12.6.3
    • Apple macOS 13.2
    • Splunk Universal Forwarder 8.2.12
    • Splunk Universal Forwarder 9.0.6

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

    Metrics

    8.1

    Priority

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

    Source: NVD, CVSS v3

    8.1

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: BSI, Siemens ProductCERT, CVE.org, OSV

    3.7 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 89.5

    Show all metrics
    Severity
    High
    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
    106.27 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
    8.1 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
    8.1
    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
    3.7 %
    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
    89.5
    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

    curl before 7.86.0 has a double free. If curl is told to use an HTTP proxy for a transfer with a non-HTTP(S) URL, it sets up the connection to the remote server by issuing a CONNECT request to the proxy, and then tunnels the rest of the protocol through. An HTTP proxy might refuse this request (HTTP proxies often only allow outgoing connections to specific port numbers, like 443 for HTTPS) and instead return a non-200 status code to the client. Due to flaws in the error/cleanup handling, this could trigger a double free in curl if one of the following schemes were used in the URL for the transfer: dict, gopher, gophers, ldap, ldaps, rtmp, rtmps, or telnet. The earliest affected version is 7.77.0.

    Source: BSI CSAF, BSI WID Portal, siemens_advisory, cvelistv5, NVD (NIST), OSV (Open Source Vulnerabilities)

    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
    • 7.77.0 – < 7.86.0
    • 7.86.0
    netappontap_9
    • —
    • —
    splunkuniversal_forwarder
    • 8.2.0 – < 8.2.12
    • 9.1.0
    • 9.0.0 – < 9.0.6
    • 8.2.12
    • —
    • 9.0.6

    Vendors and products

    Affected operating systems

    Affected operating systems
    macOSapplemacos—
    Otherfedoraprojectfedora35
    Otherfedoraprojectfedora36
    Otherfedoraprojectfedora37
    Othernetapph300s_firmware—
    Othernetapph410s_firmware—
    Othernetapph500s_firmware—
    Othernetapph700s_firmware—

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedMITRE

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      http://seclists.org/fulldisclosure/2023/Jan/19
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      http://seclists.org/fulldisclosure/2023/Jan/20
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      https://curl.se/docs/CVE-2022-42915.html
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/
      Referenceadded
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/
      Referenceadded
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/
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      https://security.gentoo.org/glsa/202212-01
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      https://security.netapp.com/advisory/ntap-20221209-0010/
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      https://support.apple.com/kb/HT213604
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      https://support.apple.com/kb/HT213605
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      http://seclists.org/fulldisclosure/2023/Jan/19
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      http://seclists.org/fulldisclosure/2023/Jan/20
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      https://curl.se/docs/CVE-2022-42915.html
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/
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      Referenceremoved
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/
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      https://security.gentoo.org/glsa/202212-01
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      https://security.netapp.com/advisory/ntap-20221209-0010/
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      https://support.apple.com/kb/HT213604
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      http://seclists.org/fulldisclosure/2023/Jan/19 Types: Mailing List, Third Party Advisory
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      http://seclists.org/fulldisclosure/2023/Jan/20 Types: Mailing List, Third Party Advisory
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      https://curl.se/docs/CVE-2022-42915.html Types: Vendor Advisory
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/ Types: Mailing List, Third Party Advisory
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/ Types: Mailing List, Third Party Advisory
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      Reference typeremoved
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/ Types: Mailing List, Third Party Advisory
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      Reference typeremoved
      https://security.gentoo.org/glsa/202212-01 Types: Third Party Advisory
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      https://security.netapp.com/advisory/ntap-20221209-0010/ Types: Third Party Advisory
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      https://support.apple.com/kb/HT213604 Types: Third Party Advisory
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      Reference typeremoved
      https://support.apple.com/kb/HT213605 Types: Third Party Advisory
      —

      Source identifier: cve@mitre.org

    2. Record modifiedCVE Program

      Show 30 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
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      http://seclists.org/fulldisclosure/2023/Jan/19
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      http://seclists.org/fulldisclosure/2023/Jan/20
      Referenceadded
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      https://curl.se/docs/CVE-2022-42915.html
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/
      Referenceadded
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/
      Referenceadded
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      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/
      Referenceadded
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      https://security.gentoo.org/glsa/202212-01
      Referenceadded
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      https://security.netapp.com/advisory/ntap-20221209-0010/
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      https://support.apple.com/kb/HT213604
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      https://support.apple.com/kb/HT213605
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      http://seclists.org/fulldisclosure/2023/Jan/19
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      https://curl.se/docs/CVE-2022-42915.html
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      Referenceremoved
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      Referenceremoved
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/
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      https://security.gentoo.org/glsa/202212-01
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      https://security.netapp.com/advisory/ntap-20221209-0010/
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      https://support.apple.com/kb/HT213604
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      http://seclists.org/fulldisclosure/2023/Jan/19 Types: Mailing List, Third Party Advisory
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      http://seclists.org/fulldisclosure/2023/Jan/20 Types: Mailing List, Third Party Advisory
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      https://curl.se/docs/CVE-2022-42915.html Types: Vendor Advisory
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      Reference typeremoved
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/ Types: Mailing List, Third Party Advisory
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      Reference typeremoved
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/ Types: Mailing List, Third Party Advisory
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      Reference typeremoved
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/ Types: Mailing List, Third Party Advisory
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      Reference typeremoved
      https://security.gentoo.org/glsa/202212-01 Types: Third Party Advisory
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      https://security.netapp.com/advisory/ntap-20221209-0010/ Types: Third Party Advisory
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      Reference typeremoved
      https://support.apple.com/kb/HT213604 Types: Third Party Advisory
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      Reference typeremoved
      https://support.apple.com/kb/HT213605 Types: Third Party Advisory
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      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. Record modifiedSiemens ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2022/42xxx/CVE-2022-42915.json">CVE-2022-42915</a>
      Referenceadded
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      https://cert-portal.siemens.com/productcert/html/ssa-398330.html
      Referenceadded
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      https://cert-portal.siemens.com/productcert/html/ssa-892048.html

      Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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