The version of openssl11 installed on the remote host is prior to 1.1.1g-12. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2023-2097 advisory.

    Issue summary: Processing some specially crafted ASN.1 object identifiers ordata containing them may be     very slow.

    Impact summary: Applications that use OBJ_obj2txt() directly, or use any ofthe OpenSSL subsystems OCSP,     PKCS7/SMIME, CMS, CMP/CRMF or TS with no messagesize limit may experience notable to very long delays when     processing thosemessages, 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 translatean ASN.1 OBJECT IDENTIFIER given in DER encoding form (using     the OpenSSLtype ASN1_OBJECT) to its canonical numeric text form, which are thesub-identifiers of the     OBJECT IDENTIFIER in decimal form, separated byperiods.

    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 hundredsof KiBs), the translation to a decimal number in text may take a     very longtime.  The time complexity is O(n^2) with 'n' being the size of thesub-identifiers in bytes (*).

    With OpenSSL 3.0, support to fetch cryptographic algorithms using names /identifiers in string form was     introduced.  This includes using OBJECTIDENTIFIERs in canonical numeric text form as identifiers for     fetchingalgorithms.

    Such OBJECT IDENTIFIERs may be received through the ASN.1 structureAlgorithmIdentifier, which is commonly     used in multiple protocols to specifywhat cryptographic algorithm should be used to sign or verify,     encrypt ordecrypt, or digest passed data.

    Applications that call OBJ_obj2txt() directly with untrusted data areaffected, with any version of     OpenSSL.  If the use is for the mere purposeof 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.509certificates, including simple things like verifying its signature.

    The impact on TLS is relatively low, because all versions of OpenSSL have a100KiB limit on the peer's     certificate chain.  Additionally, this onlyimpacts clients, or servers that have explicitly enabled     clientauthentication.

    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 waythat it would cause a Denial of Service, so these versions are     considerednot affected by this issue in such a way that it would be cause for concern,and the severity is     therefore considered low. (CVE-2023-2650)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

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Amazon Linux 2 : openssl11 (ALAS-2023-2097)

critical Nessus Plugin ID 177863

Version 1.3