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Vulnerability Details : CVE-2021-3712

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).
Publish Date : 2021-08-24 Last Update Date : 2021-10-20
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 125

- Products Affected By CVE-2021-3712

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
3 Application Netapp Clustered Data Ontap - * * * Version Details Vulnerabilities
4 Application Netapp Clustered Data Ontap Antivirus Connector - * * * Version Details Vulnerabilities
5 Application Netapp E-series Santricity Os Controller * * * * Version Details Vulnerabilities
6 Application Netapp Hci Management Node - * * * Version Details Vulnerabilities
7 Application Netapp Manageability Software Development Kit - * * * Version Details Vulnerabilities
8 Application Netapp Santricity Smi-s Provider - * * * Version Details Vulnerabilities
9 Application Netapp Solidfire - * * * Version Details Vulnerabilities
10 Application Netapp Storage Encryption - * * * Version Details Vulnerabilities
11 Application Openssl Openssl * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Netapp Clustered Data Ontap 1
Netapp Clustered Data Ontap Antivirus Connector 1
Netapp E-series Santricity Os Controller 1
Netapp Hci Management Node 1
Netapp Manageability Software Development Kit 1
Netapp Santricity Smi-s Provider 1
Netapp Solidfire 1
Netapp Storage Encryption 1
Openssl Openssl 1

- References For CVE-2021-3712
MLIST [debian-lts-announce] 20210926 [SECURITY] [DLA 2766-1] openssl security update CONFIRM[email protected]
MLIST [tomcat-dev] 20210825 OpenSSL security announcement - do we need a Tomcat Native release? CONFIRM;a=commitdiff;h=94d23fcff9b2a7a8368dfe52214d5c2569882c11 CONFIRM
MLIST [debian-lts-announce] 20210930 [SECURITY] [DLA 2774-1] openssl1.0 security update
MLIST [oss-security] 20210825 OpenSSL SM2 Decryption Buffer Overflow (CVE-2021-3711), Read buffer overruns processing ASN.1 strings (CVE-2021-3712) CONFIRM[email protected]
MLIST [tomcat-dev] 20210826 Re: OpenSSL security announcement - do we need a Tomcat Native release?
DEBIAN DSA-4963;a=commitdiff;h=ccb0a11145ee72b042d10593a64eaf9e8a55ec12 CONFIRM

- Metasploit Modules Related To CVE-2021-3712

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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