CVE-2021-23841 (GCVE-0-2021-23841)

Vulnerability from cvelistv5 – Published: 2021-02-16 16:55 – Updated: 2024-09-16 22:39
VLAI
Title
Null pointer deref in X509_issuer_and_serial_hash()
Summary
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • NULL pointer dereference
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i)
Affected: Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x)
Create a notification for this product.
Date Public
2021-02-16 00:00
Credits
Tavis Ormandy (Google)
Show details on NVD website
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1.0.2-1.0.2x)\"}]}], \"datePublic\": \"2021-02-16T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20210216.txt\"}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf\"}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807\"}, {\"url\": \"https://www.debian.org/security/2021/dsa-4855\", \"name\": \"DSA-4855\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://security.gentoo.org/glsa/202103-03\", \"name\": \"GLSA-202103-03\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/May/70\", \"name\": \"20210526 APPLE-SA-2021-05-25-2 macOS Big Sur 11.4\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/May/68\", \"name\": \"20210526 APPLE-SA-2021-05-25-5 Safari 14.1.1\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/May/67\", \"name\": \"20210526 APPLE-SA-2021-05-25-1 iOS 14.6 and iPadOS 14.6\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\"}, {\"url\": \"https://www.tenable.com/security/tns-2021-09\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210513-0002/\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210219-0009/\"}, {\"url\": \"https://www.tenable.com/security/tns-2021-03\"}, {\"url\": \"https://support.apple.com/kb/HT212529\"}, {\"url\": \"https://support.apple.com/kb/HT212528\"}, {\"url\": \"https://support.apple.com/kb/HT212534\"}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\"}, {\"url\": \"https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240621-0006/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"NULL pointer dereference\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2024-06-21T19:07:57.206Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-23841\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-09-16T22:39:57.576Z\", \"dateReserved\": \"2021-01-12T00:00:00.000Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2021-02-16T16:55:18.817Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.