Executive Summary

Informations
Name CVE-2020-1971 First vendor Publication 2020-12-08
Vendor Cve Last vendor Modification 2021-09-16

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Overall CVSS Score 5.9
Base Score 5.9 Environmental Score 5.9
impact SubScore 3.6 Temporal Score 5.9
Exploitabality Sub Score 2.2
 
Attack Vector Network Attack Complexity High
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:N/A:P)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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).

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1971

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-476 NULL Pointer Dereference

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 2
Application 1
Application 1
Application 2
Application 1
Application 1
Application 1
Application 1
Application 1
Application 1
Application 1
Application 1
Application 355
Application 1
Application 3
Application 3
Application 3
Application 3
Application 1
Application 3
Application 2
Application 1
Application 3
Application 1
Application 2
Application 5
Application 1
Application 472
Application 1
Application 3
Application 1
Application 6
Hardware 1
Hardware 1
Os 2
Os 2

Sources (Detail)

Source Url
CONFIRM https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2154ab83e14ede33...
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=f960d81215ebf3f6...
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44676
https://security.netapp.com/advisory/ntap-20201218-0005/
https://security.netapp.com/advisory/ntap-20210513-0002/
https://www.openssl.org/news/secadv/20201208.txt
https://www.tenable.com/security/tns-2020-11
https://www.tenable.com/security/tns-2021-09
https://www.tenable.com/security/tns-2021-10
DEBIAN https://www.debian.org/security/2020/dsa-4807
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedorapr...
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedorapr...
FREEBSD https://security.FreeBSD.org/advisories/FreeBSD-SA-20:33.openssl.asc
GENTOO https://security.gentoo.org/glsa/202012-13
MISC https://www.oracle.com/security-alerts/cpuApr2021.html
https://www.oracle.com/security-alerts/cpujan2021.html
MLIST http://www.openwall.com/lists/oss-security/2021/09/14/2
https://lists.apache.org/thread.html/r63c6f2dd363d9b514d0a4bcf624580616a67989...
https://lists.apache.org/thread.html/rbb769f771711fb274e0a4acb1b5911c8aab544a...
https://lists.debian.org/debian-lts-announce/2020/12/msg00020.html
https://lists.debian.org/debian-lts-announce/2020/12/msg00021.html
N/A https://www.oracle.com//security-alerts/cpujul2021.html

Alert History

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Date Informations
2021-09-16 17:23:28
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2021-09-15 09:23:24
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2021-08-05 01:37:48
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2021-07-21 05:23:03
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2021-06-15 00:23:06
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2021-06-03 00:23:04
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2021-05-14 00:23:04
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2021-05-12 05:22:56
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2021-05-05 01:39:13
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2021-05-04 13:51:01
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2021-04-22 03:02:31
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2021-02-15 09:22:47
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2021-02-07 13:22:48
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2021-01-20 21:23:24
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2021-01-19 00:22:45
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2020-12-24 05:22:48
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2020-12-22 01:33:55
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2020-12-22 01:31:26
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2020-12-21 21:23:26
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2020-12-21 09:22:47
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2020-12-18 17:22:45
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2020-12-17 01:31:31
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2020-12-17 01:29:17
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2020-12-16 21:23:32
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2020-12-16 17:22:49
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2020-12-16 00:22:47
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2020-12-14 17:22:48
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2020-12-11 01:31:20
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2020-12-11 01:29:09
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2020-12-10 17:22:50
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2020-12-10 05:22:48
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2020-12-09 05:22:53
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2020-12-08 21:24:16
  • First insertion