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CVE-2020-1971

MEDIUMCVSS 5.9/10EPSS 6.97%

Last modified

CVE-2020-1971 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. EPSS estimates a 6.97% chance of exploitation in the next 30 days.

Description

The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the "-crl_download" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).

Metrics

CVSS 3.1
5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
6.97%

93.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OpensslOpenssl>= 1.0.2, < 1.0.2x
OpensslOpenssl>= 1.1.1, < 1.1.1i
DebianDebian Linux9.0
DebianDebian Linux10.0
FedoraprojectFedora32
FedoraprojectFedora33
OracleApi Gateway11.1.2.4.0
OracleBusiness Intelligence5.5.0.0.0
OracleBusiness Intelligence5.9.0.0.0
OracleBusiness Intelligence12.2.1.3.0
OracleBusiness Intelligence12.2.1.4.0
OracleCommunications Cloud Native Core Network Function Cloud Native Environment1.10.0
OracleCommunications Diameter Intelligence Hub>= 8.0.0, <= 8.1.0
OracleCommunications Diameter Intelligence Hub>= 8.2.0, <= 8.2.3
OracleCommunications Session Border Controllercz8.2
OracleCommunications Session Border Controllercz8.3
OracleCommunications Session Border Controllercz8.4
OracleCommunications Session Routercz8.2
OracleCommunications Session Routercz8.3
OracleCommunications Session Routercz8.4
OracleCommunications Subscriber-Aware Load Balancercz8.2
OracleCommunications Subscriber-Aware Load Balancercz8.3
OracleCommunications Subscriber-Aware Load Balancercz8.4
OracleCommunications Unified Session Managerscz8.2.5
OracleEnterprise Communications Brokerpcz3.1
OracleEnterprise Communications Brokerpcz3.2
OracleEnterprise Communications Brokerpcz3.3
OracleEnterprise Manager Base Platform13.3.0.0
OracleEnterprise Manager Base Platform13.4.0.0
OracleEnterprise Manager For Storage Management13.4.0.0
OracleEnterprise Manager Ops Center12.4.0.0
OracleEnterprise Session Border Controllercz8.2
OracleEnterprise Session Border Controllercz8.3
OracleEnterprise Session Border Controllercz8.4
OracleEssbase21.2
OracleGraalvm19.3.4
OracleGraalvm20.3.0
OracleHttp Server12.2.1.4.0
OracleJd Edwards Enterpriseone Tools< 9.2.5.3
OracleJd Edwards World Securitya9.4
OracleMysql<= 8.0.22
OracleMysql Server<= 5.7.32
OracleMysql Server>= 8.0.15, <= 8.0.22
OraclePeoplesoft Enterprise Peopletools8.56
OraclePeoplesoft Enterprise Peopletools8.57
OraclePeoplesoft Enterprise Peopletools8.58
NetappActive Iq Unified ManagerAll versions
NetappClustered Data Ontap Antivirus ConnectorAll versions
NetappData OntapAll versions
NetappE-Series Santricity Os Controller>= 11.0.0, <= 11.60.3

Showing 50 of 72 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-1971?
The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the "-crl_download" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).
How severe is CVE-2020-1971?
CVE-2020-1971 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 6.97% probability of exploitation in the next 30 days.
How do I fix CVE-2020-1971?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1971?

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Source: NVD / NIST