CVE-2023-2650 (GCVE-0-2023-2650)

Vulnerability from cvelistv5 – Published: 2023-05-30 13:40 – Updated: 2025-03-19 15:25
VLAI
Title
Possible DoS translating ASN.1 object identifiers
Summary
Issue summary: Processing some specially crafted ASN.1 object identifiers or data containing them may be very slow. Impact summary: Applications that use OBJ_obj2txt() directly, or use any of the OpenSSL subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS with no message size limit may experience notable to very long delays when processing those messages, which may lead to a Denial of Service. An OBJECT IDENTIFIER is composed of a series of numbers - sub-identifiers - most of which have no size limit. OBJ_obj2txt() may be used to translate an ASN.1 OBJECT IDENTIFIER given in DER encoding form (using the OpenSSL type ASN1_OBJECT) to its canonical numeric text form, which are the sub-identifiers of the OBJECT IDENTIFIER in decimal form, separated by periods. When one of the sub-identifiers in the OBJECT IDENTIFIER is very large (these are sizes that are seen as absurdly large, taking up tens or hundreds of KiBs), the translation to a decimal number in text may take a very long time. The time complexity is O(n^2) with 'n' being the size of the sub-identifiers in bytes (*). With OpenSSL 3.0, support to fetch cryptographic algorithms using names / identifiers in string form was introduced. This includes using OBJECT IDENTIFIERs in canonical numeric text form as identifiers for fetching algorithms. Such OBJECT IDENTIFIERs may be received through the ASN.1 structure AlgorithmIdentifier, which is commonly used in multiple protocols to specify what cryptographic algorithm should be used to sign or verify, encrypt or decrypt, or digest passed data. Applications that call OBJ_obj2txt() directly with untrusted data are affected, with any version of OpenSSL. If the use is for the mere purpose of display, the severity is considered low. In OpenSSL 3.0 and newer, this affects the subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS. It also impacts anything that processes X.509 certificates, including simple things like verifying its signature. The impact on TLS is relatively low, because all versions of OpenSSL have a 100KiB limit on the peer's certificate chain. Additionally, this only impacts clients, or servers that have explicitly enabled client authentication. In OpenSSL 1.1.1 and 1.0.2, this only affects displaying diverse objects, such as X.509 certificates. This is assumed to not happen in such a way that it would cause a Denial of Service, so these versions are considered not affected by this issue in such a way that it would be cause for concern, and the severity is therefore considered low.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • inefficient algorithmic complexity
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.1.1 , < 3.1.1 (semver)
Affected: 3.0.0 , < 3.0.9 (semver)
Affected: 1.1.1 , < 1.1.1u (custom)
Affected: 1.0.2 , < 1.0.2zh (custom)
Create a notification for this product.
Date Public
2023-05-30 00:00
Credits
OSSFuzz Matt Caswell Richard Levitte
Show details on NVD website
To clipboard 

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OBJ_obj2txt() may be used to translate\\nan ASN.1 OBJECT IDENTIFIER given in DER encoding form (using the OpenSSL\\ntype ASN1_OBJECT) to its canonical numeric text form, which are the\\nsub-identifiers of the OBJECT IDENTIFIER in decimal form, separated by\\nperiods.\\n\\nWhen one of the sub-identifiers in the OBJECT IDENTIFIER is very large\\n(these are sizes that are seen as absurdly large, taking up tens or hundreds\\nof KiBs), the translation to a decimal number in text may take a very long\\ntime.  The time complexity is O(n^2) with \u0027n\u0027 being the size of the\\nsub-identifiers in bytes (*).\\n\\nWith OpenSSL 3.0, support to fetch cryptographic algorithms using names /\\nidentifiers in string form was introduced.  This includes using OBJECT\\nIDENTIFIERs in canonical numeric text form as identifiers for fetching\\nalgorithms.\\n\\nSuch OBJECT IDENTIFIERs may be received through the ASN.1 structure\\nAlgorithmIdentifier, which is commonly used in multiple protocols to specify\\nwhat cryptographic algorithm should be used to sign or verify, encrypt or\\ndecrypt, or digest passed data.\\n\\nApplications that call OBJ_obj2txt() directly with untrusted data are\\naffected, with any version of OpenSSL.  If the use is for the mere purpose\\nof display, the severity is considered low.\\n\\nIn OpenSSL 3.0 and newer, this affects the subsystems OCSP, PKCS7/SMIME,\\nCMS, CMP/CRMF or TS.  It also impacts anything that processes X.509\\ncertificates, including simple things like verifying its signature.\\n\\nThe impact on TLS is relatively low, because all versions of OpenSSL have a\\n100KiB limit on the peer\u0027s certificate chain.  Additionally, this only\\nimpacts clients, or servers that have explicitly enabled client\\nauthentication.\\n\\nIn OpenSSL 1.1.1 and 1.0.2, this only affects displaying diverse objects,\\nsuch as X.509 certificates.  This is assumed to not happen in such a way\\nthat it would cause a Denial of Service, so these versions are considered\\nnot affected by this issue in such a way that it would be cause for concern,\\nand the severity is therefore considered low.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Processing some specially crafted ASN.1 object identifiers or\u003cbr\u003edata containing them may be very slow.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that use OBJ_obj2txt() directly, or use any of\u003cbr\u003ethe OpenSSL subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS with no message\u003cbr\u003esize limit may experience notable to very long delays when processing those\u003cbr\u003emessages, which may lead to a Denial of Service.\u003cbr\u003e\u003cbr\u003eAn OBJECT IDENTIFIER is composed of a series of numbers - sub-identifiers -\u003cbr\u003emost of which have no size limit.  OBJ_obj2txt() may be used to translate\u003cbr\u003ean ASN.1 OBJECT IDENTIFIER given in DER encoding form (using the OpenSSL\u003cbr\u003etype ASN1_OBJECT) to its canonical numeric text form, which are the\u003cbr\u003esub-identifiers of the OBJECT IDENTIFIER in decimal form, separated by\u003cbr\u003eperiods.\u003cbr\u003e\u003cbr\u003eWhen one of the sub-identifiers in the OBJECT IDENTIFIER is very large\u003cbr\u003e(these are sizes that are seen as absurdly large, taking up tens or hundreds\u003cbr\u003eof KiBs), the translation to a decimal number in text may take a very long\u003cbr\u003etime.  The time complexity is O(n^2) with \u0027n\u0027 being the size of the\u003cbr\u003esub-identifiers in bytes (*).\u003cbr\u003e\u003cbr\u003eWith OpenSSL 3.0, support to fetch cryptographic algorithms using names /\u003cbr\u003eidentifiers in string form was introduced.  This includes using OBJECT\u003cbr\u003eIDENTIFIERs in canonical numeric text form as identifiers for fetching\u003cbr\u003ealgorithms.\u003cbr\u003e\u003cbr\u003eSuch OBJECT IDENTIFIERs may be received through the ASN.1 structure\u003cbr\u003eAlgorithmIdentifier, which is commonly used in multiple protocols to specify\u003cbr\u003ewhat cryptographic algorithm should be used to sign or verify, encrypt or\u003cbr\u003edecrypt, or digest passed data.\u003cbr\u003e\u003cbr\u003eApplications that call OBJ_obj2txt() directly with untrusted data are\u003cbr\u003eaffected, with any version of OpenSSL.  If the use is for the mere purpose\u003cbr\u003eof display, the severity is considered low.\u003cbr\u003e\u003cbr\u003eIn OpenSSL 3.0 and newer, this affects the subsystems OCSP, PKCS7/SMIME,\u003cbr\u003eCMS, CMP/CRMF or TS.  It also impacts anything that processes X.509\u003cbr\u003ecertificates, including simple things like verifying its signature.\u003cbr\u003e\u003cbr\u003eThe impact on TLS is relatively low, because all versions of OpenSSL have a\u003cbr\u003e100KiB limit on the peer\u0027s certificate chain.  Additionally, this only\u003cbr\u003eimpacts clients, or servers that have explicitly enabled client\u003cbr\u003eauthentication.\u003cbr\u003e\u003cbr\u003eIn OpenSSL 1.1.1 and 1.0.2, this only affects displaying diverse objects,\u003cbr\u003esuch as X.509 certificates.  This is assumed to not happen in such a way\u003cbr\u003ethat it would cause a Denial of Service, so these versions are considered\u003cbr\u003enot affected by this issue in such a way that it would be cause for concern,\u003cbr\u003eand the severity is therefore considered low.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"inefficient algorithmic complexity\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2024-02-04T09:06:37.503Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-2650\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-19T15:25:32.613Z\", \"dateReserved\": \"2023-05-11T06:09:26.543Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2023-05-30T13:40:11.963Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.