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 ?
No CVSS data available.
CWE
- inefficient algorithmic complexity
Assigner
References
12 references
Impacted products
Date Public ?
2023-05-30 00:00
Credits
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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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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