Executive Summary



This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Informations
Name CVE-2021-23841 First vendor Publication 2021-02-16
Vendor Cve Last vendor Modification 2021-07-20

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 OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23841

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-190 Integer Overflow or Wraparound (CWE/SANS Top 25)

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 264
Application 1
Application 1
Application 1
Application 355
Application 1
Application 3
Application 23
Application 1
Application 5
Application 3
Os 1
Os 167
Os 1
Os 1
Os 1

Sources (Detail)

Source Url
CONFIRM https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=122a19ab48091c65...
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8252ee4d90f3f200...
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
https://security.netapp.com/advisory/ntap-20210219-0009/
https://security.netapp.com/advisory/ntap-20210513-0002/
https://support.apple.com/kb/HT212528
https://support.apple.com/kb/HT212529
https://support.apple.com/kb/HT212534
https://www.openssl.org/news/secadv/20210216.txt
https://www.tenable.com/security/tns-2021-03
https://www.tenable.com/security/tns-2021-09
DEBIAN https://www.debian.org/security/2021/dsa-4855
FULLDISC http://seclists.org/fulldisclosure/2021/May/67
http://seclists.org/fulldisclosure/2021/May/68
http://seclists.org/fulldisclosure/2021/May/70
GENTOO https://security.gentoo.org/glsa/202103-03
MISC https://www.oracle.com/security-alerts/cpuApr2021.html

Alert History

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Date Informations
2021-07-21 05:23:01
  • Multiple Updates
2021-07-15 05:23:01
  • Multiple Updates
2021-06-17 21:23:32
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2021-06-15 00:23:04
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2021-05-27 00:22:57
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2021-05-26 21:23:20
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2021-05-25 09:23:01
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2021-05-25 00:23:04
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2021-05-14 00:23:03
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2021-05-12 05:22:56
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2021-05-04 14:08:23
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2021-04-22 03:13:41
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2021-03-31 21:23:19
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2021-03-26 12:38:11
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2021-02-19 17:22:57
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2021-02-18 21:23:34
  • Multiple Updates
2021-02-18 00:22:58
  • Multiple Updates
2021-02-16 21:23:27
  • First insertion