Executive Summary

Informations
Name CVE-2021-3712 First vendor Publication 2021-08-24
Vendor Cve Last vendor Modification 2021-10-22

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Overall CVSS Score 7.4
Base Score 7.4 Environmental Score 7.4
impact SubScore 5.2 Temporal Score 7.4
Exploitabality Sub Score 2.2
 
Attack Vector Network Attack Complexity High
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact High
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:P/I:N/A:P)
Cvss Base Score 5.8 Attack Range Network
Cvss Impact Score 4.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING structure which contains a buffer holding the string data and a field holding the buffer length. This contrasts with normal C strings which are repesented as a buffer for the string data which is terminated with a NUL (0) byte. Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL's own "d2i" functions (and other similar parsing functions) as well as any string whose value has been set with the ASN1_STRING_set() function will additionally NUL terminate the byte array in the ASN1_STRING structure. However, it is possible for applications to directly construct valid ASN1_STRING structures which do not NUL terminate the byte array by directly setting the "data" and "length" fields in the ASN1_STRING array. This can also happen by using the ASN1_STRING_set0() function. Numerous OpenSSL functions that print ASN.1 data have been found to assume that the ASN1_STRING byte array will be NUL terminated, even though this is not guaranteed for strings that have been directly constructed. Where an application requests an ASN.1 structure to be printed, and where that ASN.1 structure contains ASN1_STRINGs that have been directly constructed by the application without NUL terminating the "data" field, then a read buffer overrun can occur. The same thing can also occur during name constraints processing of certificates (for example if a certificate has been directly constructed by the application instead of loading it via the OpenSSL parsing functions, and the certificate contains non NUL terminated ASN1_STRING structures). It can also occur in the X509_get1_email(), X509_REQ_get1_email() and X509_get1_ocsp() functions. If a malicious actor can cause an application to directly construct an ASN1_STRING and then process it through one of the affected OpenSSL functions then this issue could be hit. This might result in a crash (causing a Denial of Service attack). It could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext). Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). Fixed in OpenSSL 1.0.2za (Affected 1.0.2-1.0.2y).

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3712

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-125 Out-of-bounds Read

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Application 1
Application 2
Application 1
Application 1
Application 1
Application 1
Application 1
Application 355
Os 2

Sources (Detail)

Source Url
CONFIRM https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=94d23fcff9b2a7a8...
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=ccb0a11145ee72b0...
https://kc.mcafee.com/corporate/index?page=content&id=SB10366
https://security.netapp.com/advisory/ntap-20210827-0010/
https://www.openssl.org/news/secadv/20210824.txt
https://www.tenable.com/security/tns-2021-16
DEBIAN https://www.debian.org/security/2021/dsa-4963
MISC https://www.oracle.com/security-alerts/cpuoct2021.html
MLIST http://www.openwall.com/lists/oss-security/2021/08/26/2
https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249...
https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17...
https://lists.debian.org/debian-lts-announce/2021/09/msg00014.html
https://lists.debian.org/debian-lts-announce/2021/09/msg00021.html

Alert History

If you want to see full details history, please login or register.
0
1
2
3
4
5
6
7
8
9
10
11
12
Date Informations
2021-10-22 13:23:13
  • Multiple Updates
2021-10-20 17:23:10
  • Multiple Updates
2021-10-01 09:23:47
  • Multiple Updates
2021-09-27 09:23:06
  • Multiple Updates
2021-09-23 00:23:10
  • Multiple Updates
2021-08-31 21:23:13
  • Multiple Updates
2021-08-27 17:23:17
  • Multiple Updates
2021-08-27 13:22:55
  • Multiple Updates
2021-08-26 21:23:11
  • Multiple Updates
2021-08-26 13:22:49
  • Multiple Updates
2021-08-25 17:22:48
  • Multiple Updates
2021-08-25 05:22:51
  • Multiple Updates
2021-08-24 21:23:11
  • First insertion