CriticalCVE-2002-0083

    OpenBSD OpenSSH: Privilege Escalation (CVE-2002-0083)

    Published Sources: CVE.org

    What is affected, what to do

    Off-by-one error in the channel code of OpenSSH 2.0 through 3.0.2 allows local users or remote malicious servers to gain privileges.

    Update OpenBSD OpenSSH to version 3.1.

    Affected
    • Immunix eq 7.0..7.0
    • MandrakeSoft Mandrake Single Network Firewall eq 7.2..7.2
    • OpenBSD OpenSSH lt 2.0..3.1
    • OpenPKG eq 1.0..1.0
    • Conectiva Conectiva Linux prg graficos eq 5.0..5.0
    • Conectiva Conectiva Linux prg graficos eq 5.1..5.1
    • Conectiva Conectiva Linux prg graficos eq 6.0..6.0
    • Conectiva Conectiva Linux prg graficos eq 7.0..7.0
    • Conectiva Conectiva Linux prg graficos eq ecommerce..ecommerce
    • Conectiva Conectiva Linux prg graficos eq graficas..graficas
    • Engarde Secure Linux eq 1.0.1..1.0.1
    • MandrakeSoft Mandrake Linux eq 7.1..7.1
    • MandrakeSoft Mandrake Linux eq 7.2..7.2
    • MandrakeSoft Mandrake Linux eq 8.0..8.0
    • MandrakeSoft Mandrake Linux eq 8.1..8.1
    • MandrakeSoft Mandrake Corporate Server eq 1.0.1..1.0.1
    • Red Hat Linux eq 7.0..7.0
    • Red Hat Linux eq 7.1..7.1
    • Red Hat Linux eq 7.2..7.2
    • SuSE SuSE Linux eq 6.4..6.4
    • SuSE SuSE Linux eq 7.0..7.0
    • SuSE SuSE Linux eq 7.1..7.1
    • SuSE SuSE Linux eq 7.2..7.2
    • SuSE SuSE Linux eq 7.3..7.3
    • Trustix Trustix Linux eq 1.1..1.1
    • Trustix Trustix Linux eq 1.2..1.2
    • Trustix Trustix Linux eq 1.5..1.5
    Fixed in
    • OpenBSD OpenSSH 3.1

    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: CVE.org

    14.7 %

    EPSS score

    Elevated — model estimates 10-50% exploitation likelihood.

    Source: FIRST EPSS, percentile 96.7

    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
    123.71 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
    14.7 %
    Elevated — model estimates 10-50% 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
    96.7
    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

    Off-by-one error in the channel code of OpenSSH 2.0 through 3.0.2 allows local users or remote malicious servers to gain privileges.

    Source: 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
    immuniximmunix
    • 7.0
    • —
    mandrakesoftmandrake_single_network_firewall
    • 7.2
    • —
    openbsdopenssh
    • 2.0 – < 3.1
    • 3.1
    openpkgopenpkg
    • 1.0
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxconectivalinux5.0
    Linuxconectivalinux5.1
    Linuxconectivalinux6.0
    Linuxconectivalinux7.0
    Linuxconectivalinuxecommerce
    Linuxconectivalinuxgraficas
    Linuxredhatlinux7.0
    Linuxredhatlinux7.1
    Linuxredhatlinux7.2
    Linuxmandrakesoftmandrake_linux7.1
    Linuxmandrakesoftmandrake_linux7.2
    Linuxmandrakesoftmandrake_linux8.0
    Linuxmandrakesoftmandrake_linux8.1
    Linuxmandrakesoftmandrake_linux_corporate_server1.0.1
    Linuxengardelinuxsecure_linux1.0.1
    Linuxtrustixsecure_linux1.1
    Linuxtrustixsecure_linux1.2
    Linuxtrustixsecure_linux1.5
    Linuxsusesuse_linux6.4
    Linuxsusesuse_linux7.0
    Linuxsusesuse_linux7.1
    Linuxsusesuse_linux7.2
    Linuxsusesuse_linux7.3

    References & sources

    • archives.neohapsis.com20020311 TSLSA-2002-0039 - opensshMailing list, x_refsource_BUGTRAQ
    • osvdb.org730Vulnerability database, x_refsource_OSVDB
    • securityfocus.com4241Vulnerability database, x_refsource_BID
    • marc.info20020308 [OpenPKG-SA-2002.002] OpenPKG Security Advisory (openssh)Mailing list, x_refsource_BUGTRAQ
    • online.securityfocus.comHPSBTL0203-029Vendor advisory, x_refsource_HP
    • debian.orgDSA-119Vendor advisory, x_refsource_DEBIAN
    • novell.comSuSE-SA:2002:009Vendor advisory, x_refsource_SUSE
    • calderasystems.comCSSA-2002-012.0Vendor advisory, x_refsource_CALDERA
    • marc.info20020310 OpenSSH 2.9.9p2 packages for Immunix 6.2 with latest fixMailing list, x_refsource_BUGTRAQ
    • linuxsecurity.comESA-20020307-007Vendor advisory, x_refsource_ENGARDE
    • distro.conectiva.com.brCLA-2002:467Vendor advisory, x_refsource_CONECTIVA
    • marc.info20020307 OpenSSH Security Advisory (adv.channelalloc)Mailing list, x_refsource_BUGTRAQ
    • marc.info20020307 [PINE-CERT-20020301] OpenSSH off-by-oneMailing list, x_refsource_BUGTRAQ
    • linux-mandrake.comMDKSA-2002:019Vendor advisory, x_refsource_MANDRAKE
    • redhat.comRHSA-2002:043Vendor advisory, x_refsource_REDHAT
    • iss.netopenssh-channel-error(8383)Vulnerability database, x_refsource_XF
    • openbsd.orgadvisories/ssh_channelalloc.txtx_refsource_CONFIRM
    • online.securityfocus.com20020328 OpenSSH channel_lookup() off by one exploitMailing list, x_refsource_BUGTRAQ
    • archives.neohapsis.com20020307 [VulnWatch] [PINE-CERT-20020301] OpenSSH off-by-oneMailing list, x_refsource_VULNWATCH
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