CVE-2018-0734 (GCVE-0-2018-0734)

Vulnerability from cvelistv5 – Published: 2018-10-30 12:00 – Updated: 2024-09-16 23:10
VLAI
Title
Timing attack against DSA
Summary
The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).
Severity
No CVSS data available.
CWE
  • Constant time issue
Assigner
References
URL Tags
https://www.oracle.com/technetwork/security-advis… x_refsource_CONFIRM
https://usn.ubuntu.com/3840-1/ vendor-advisoryx_refsource_UBUNTU
https://www.debian.org/security/2018/dsa-4355 vendor-advisoryx_refsource_DEBIAN
https://security.netapp.com/advisory/ntap-2018110… x_refsource_CONFIRM
https://git.openssl.org/gitweb/?p=openssl.git%3Ba… x_refsource_CONFIRM
https://www.tenable.com/security/tns-2018-17 x_refsource_CONFIRM
https://nodejs.org/en/blog/vulnerability/november… x_refsource_CONFIRM
https://www.tenable.com/security/tns-2018-16 x_refsource_CONFIRM
http://www.securityfocus.com/bid/105758 vdb-entryx_refsource_BID
https://git.openssl.org/gitweb/?p=openssl.git%3Ba… x_refsource_CONFIRM
https://www.debian.org/security/2018/dsa-4348 vendor-advisoryx_refsource_DEBIAN
https://git.openssl.org/gitweb/?p=openssl.git%3Ba… x_refsource_CONFIRM
https://www.openssl.org/news/secadv/20181030.txt x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2019011… x_refsource_CONFIRM
https://www.oracle.com/technetwork/security-advis… x_refsource_MISC
https://security.netapp.com/advisory/ntap-2019042… x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://www.oracle.com/technetwork/security-advis… x_refsource_MISC
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://access.redhat.com/errata/RHSA-2019:2304 vendor-advisoryx_refsource_REDHAT
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://access.redhat.com/errata/RHSA-2019:3700 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:3933 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:3935 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:3932 vendor-advisoryx_refsource_REDHAT
https://www.oracle.com/security-alerts/cpujan2020.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2020.html x_refsource_MISC
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1a (Affected 1.1.1)
Affected: Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i)
Affected: Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p)
Create a notification for this product.
Date Public
2018-10-30 00:00
Credits
Samuel Weiser
Show details on NVD website
To clipboard 

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              "url": "https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/"
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            {
              "name": "https://www.tenable.com/security/tns-2018-16",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2018-16"
            },
            {
              "name": "105758",
              "refsource": "BID",
              "url": "http://www.securityfocus.com/bid/105758"
            },
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              "name": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=ef11e19d1365eea2b1851e6f540a0bf365d303e7",
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              "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=ef11e19d1365eea2b1851e6f540a0bf365d303e7"
            },
            {
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              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2018/dsa-4348"
            },
            {
              "name": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=43e6a58d4991a451daf4891ff05a48735df871ac",
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              "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=43e6a58d4991a451daf4891ff05a48735df871ac"
            },
            {
              "name": "https://www.openssl.org/news/secadv/20181030.txt",
              "refsource": "CONFIRM",
              "url": "https://www.openssl.org/news/secadv/20181030.txt"
            },
            {
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              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20190118-0002/"
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            {
              "name": "https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html",
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              "url": "https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20190423-0002/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20190423-0002/"
            },
            {
              "name": "openSUSE-SU-2019:1547",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html"
            },
            {
              "name": "https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html"
            },
            {
              "name": "openSUSE-SU-2019:1814",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html"
            },
            {
              "name": "RHSA-2019:2304",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:2304"
            },
            {
              "name": "FEDORA-2019-db06efdea1",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EWC42UXL5GHTU5G77VKBF6JYUUNGSHOM/"
            },
            {
              "name": "FEDORA-2019-00c25b9379",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZBEV5QGDRFUZDMNECFXUSN5FMYOZDE4V/"
            },
            {
              "name": "FEDORA-2019-9a0a7c0986",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3IVFGSERAZLNJCK35TEM2R4726XIH3Z/"
            },
            {
              "name": "RHSA-2019:3700",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3700"
            },
            {
              "name": "RHSA-2019:3933",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3933"
            },
            {
              "name": "RHSA-2019:3935",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3935"
            },
            {
              "name": "RHSA-2019:3932",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3932"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpujan2020.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpujan2020.html"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2020.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2018-0734",
    "datePublished": "2018-10-30T12:00:00.000Z",
    "dateReserved": "2017-11-30T00:00:00.000Z",
    "dateUpdated": "2024-09-16T23:10:36.543Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2018-0734",
      "date": "2026-07-12",
      "epss": "0.12154",
      "percentile": "0.95675"
    },
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).\"}, {\"lang\": \"es\", \"value\": \"Se ha demostrado que el algoritmo de firmas DSA en OpenSSL es vulnerable a un ataque de sincronizaci\\u00f3n de canal lateral. Un atacante podr\\u00eda emplear variaciones en el algoritmo de firma para recuperar la clave privada. Se ha solucionado en OpenSSL 1.1.1a (afecta a 1.1.1). Se ha solucionado en OpenSSL 1.1.0j (afecta a 1.1.0-1.1.0i). Se ha solucionado en OpenSSL 1.0.2q (afecta a 1.0.2-1.0.2p).\"}]",
      "id": "CVE-2018-0734",
      "lastModified": "2024-11-21T03:38:50.120",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N\", \"baseScore\": 5.9, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:P/I:N/A:N\", \"baseScore\": 4.3, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2018-10-30T12:29:00.257",
      "references": "[{\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"http://www.securityfocus.com/bid/105758\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2019:2304\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2019:3700\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2019:3932\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Third Party 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      "sourceIdentifier": "openssl-security@openssl.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-327\"}]}]"
    },
    "microsoft_vex": {
      "current_release_date": "2026-04-30T01:52:46.000Z",
      "cve": "CVE-2018-0734",
      "id": "msrc_CVE-2018-0734",
      "initial_release_date": "2018-10-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "6",
      "product_status:known_not_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Timing attack against DSA",
      "url": "https://msrc.microsoft.com/csaf/vex/2018/msrc_cve-2018-0734.json",
      "version": "6"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2018-0734\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2018-10-30T12:29:00.257\",\"lastModified\":\"2024-11-21T03:38:50.120\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).\"},{\"lang\":\"es\",\"value\":\"Se ha demostrado que el algoritmo de firmas DSA en OpenSSL es vulnerable a un ataque de sincronizaci\u00f3n de canal lateral. Un atacante podr\u00eda emplear variaciones en el algoritmo de firma para recuperar la clave privada. Se ha solucionado en OpenSSL 1.1.1a (afecta a 1.1.1). Se ha solucionado en OpenSSL 1.1.0j (afecta a 1.1.0-1.1.0i). Se ha solucionado en OpenSSL 1.0.2q (afecta a 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T11:47:51+00:00",
      "cve": "CVE-2018-0734",
      "id": "CVE-2018-0734",
      "initial_release_date": "2018-10-16T00:00:00+00:00",
      "product_status:fixed": "292",
      "product_status:known_affected": "17",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssl: timing side channel attack in the DSA signature algorithm",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-0734.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.