SM2 Decryption Buffer Overflow

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Summary

CVECVE-2021-3711
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-24 15:15:09 UTC
Updated2026-10-08 21:17:40 UTC
DescriptionIn order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the "out" parameter can be NULL and, on exit, the "outlen" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the "out" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k).

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

Problem Types: CWE-120 | Buffer overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 11.0 All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp Clustered Data Ontap - All All All
Application Netapp Clustered Data Ontap Antivirus Connector - All All All
Application Netapp E-series Santricity Os Controller All All All All
Application Netapp Hci Management Node - All All All
Application Netapp Manageability Software Development Kit - All All All
Application Netapp Oncommand Insight - All All All
Application Netapp Oncommand Workflow Automation - All All All
Application Netapp Santricity Smi-s Provider - All All All
Application Netapp Snapcenter - All All All
Application Netapp Solidfire - All All All
Application Netapp Storage Encryption - All All All
Application Openssl Openssl All All All All
Application Oracle Communications Cloud Native Core Security Edge Protection Proxy 1.7.0 All All All
Application Oracle Communications Cloud Native Core Unified Data Repository 1.15.0 All All All
Application Oracle Communications Session Border Controller 8.4 All All All
Application Oracle Communications Session Border Controller 9.0 All All All
Application Oracle Communications Unified Session Manager 8.2.5 All All All
Application Oracle Communications Unified Session Manager 8.4.5 All All All
Application Oracle Enterprise Communications Broker 3.2.0 All All All
Application Oracle Enterprise Communications Broker 3.3.0 All All All
Application Oracle Enterprise Session Border Controller 8.4 All All All
Application Oracle Enterprise Session Border Controller 9.0 All All All
Application Oracle Essbase All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k) Not specified

References

ReferenceSourceLinkTags
Oracle Critical Patch Update Advisory - April 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
August 2021 OpenSSL Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Oracle Critical Patch Update Advisory - October 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
October 2021 MySQL Server Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
[R1] Nessus Network Monitor 6.0.0 Fixes Multiple Third-party Vulnerabilities - Security Advisory | Tenable® af854a3a-2127-422b-91ae-364da2661108 www.tenable.com Third Party Advisory
www.openssl.org/news/secadv/20210824.txt af854a3a-2127-422b-91ae-364da2661108 www.openssl.org Vendor Advisory
[R1] Stand-alone Security Patch Available for Tenable.sc versions 5.16.0 to 5.19.1 - Security Advisory | Tenable® af854a3a-2127-422b-91ae-364da2661108 www.tenable.com Third Party Advisory
OpenSSL: Multiple Vulnerabilities (GLSA 202210-02) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
Oracle Critical Patch Update Advisory - January 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
security.netapp.com/advisory/ntap-20240621-0006 af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e58... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
git.openssl.org Git - openssl.git/commitdiff af854a3a-2127-422b-91ae-364da2661108 git.openssl.org
oss-security - OpenSSL SM2 Decryption Buffer Overflow (CVE-2021-3711), Read buffer overruns processing ASN.1 strings (CVE-2021-3712) af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
IBM Spectrum Protect: Multiple Vulnerabilities (GLSA 202209-02) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com Third Party Advisory
Debian -- Security Information -- DSA-4963-1 openssl af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
git.openssl.org Git - openssl.git/commitdiff MITRE git.openssl.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: John Ouyang (en)

Legacy QID Mappings

  • 178774 Debian Security Update for Open Secure Sockets Layer (OpenSSL) (DSA 4963-1)
  • 183872 Debian Security Update for Open Secure Sockets Layer (OpenSSL) (CVE-2021-3711)
  • 198469 Ubuntu Security Notification for Open Secure Sockets Layer (OpenSSL) Vulnerabilities (USN-5051-1)
  • 20236 Oracle MySQL October 2021 Critical Patch Update (CPU October 2021)
  • 296061 Oracle Solaris 11.4 Support Repository Update (SRU) 42.113.1 Missing (CPUJAN2022)
  • 376103 Open Secure Sockets Layer (OpenSSL) Security Update
  • 376204 Mysql Workbench Critical Patch Update Oct 2021
  • 376257 Oracle PeopleSoft Enterprise PeopleTools Product Multiple Vulnerabilities (CPUJAN2022)
  • 376367 Oracle Essbase Administration Services Security Update (CPUJAN2022)
  • 379452 IBM Cognos Analytics Multiple Vulnerabilities (7123154)
  • 38855 Open Secure Sockets Layer (OpenSSL) Security Update (OpenSSL Security Advisory 20210824)
  • 500499 Alpine Linux Security Update for Open Secure Sockets Layer (OpenSSL)
  • 500567 Alpine Linux Security Update for Open Secure Sockets Layer (OpenSSL)
  • 500766 Alpine Linux Security Update for openssl
  • 501166 Alpine Linux Security Update for openssl
  • 501985 Alpine Linux Security Update for Open Secure Sockets Layer3 (OpenSSL3)
  • 502904 Alpine Linux Security Update for openssl1.1-compat
  • 504258 Alpine Linux Security Update for openssl
  • 505781 Alpine Linux Security Update for openssl1.1-compat
  • 590870 Mitsubishi Electric MELSOFT iQ AppPortal Multiple Vulnerabilities (ICSA-22-132-02)
  • 670831 EulerOS Security Update for Open Secure Sockets Layer (OpenSSL) (EulerOS-SA-2021-2717)
  • 670993 EulerOS Security Update for Open Secure Sockets Layer111d (OpenSSL111d) (EulerOS-SA-2021-2668)
  • 671015 EulerOS Security Update for Open Secure Sockets Layer (OpenSSL) (EulerOS-SA-2021-2692)
  • 671019 EulerOS Security Update for Open Secure Sockets Layer (OpenSSL) (EulerOS-SA-2021-2639)
  • 690055 Free Berkeley Software Distribution (FreeBSD) Security Update for Open Secure Sockets Layer (OpenSSL) (96811d4a-04ec-11ec-9b84-d4c9ef517024)
  • 690192 Free Berkeley Software Distribution (FreeBSD) Security Update for mysql (c9387e4d-2f5f-11ec-8be6-d4c9ef517024)
  • 710616 Gentoo Linux IBM Spectrum Protect Multiple Vulnerabilities (GLSA 202209-02)
  • 710638 Gentoo Linux Open Secure Sockets Layer (OpenSSL) Multiple Vulnerabilities (GLSA 202210-02)
  • 730206 McAfee Web Gateway Multiple Vulnerabilities (WP-3792, WP-4003, WP-4021, WP-4058, WP-4067)
  • 751031 SUSE Enterprise Linux Security Update for Open Secure Sockets Layer (OpenSSL) (SUSE-SU-2021:2833-1)
  • 751035 OpenSUSE Security Update for openssl-1_1 (openSUSE-SU-2021:2830-1)
  • 751050 OpenSUSE Security Update for Open Secure Sockets Layer (OpenSSL) (openSUSE-SU-2021:1188-1)
  • 752251 SUSE Enterprise Linux Security Update for SUSE Manager Client Tools (SUSE-SU-2022:2134-1)
  • 752995 SUSE Enterprise Linux Security Update for grafana (SUSE-SU-2022:4428-1)
  • 900333 Common Base Linux Mariner (CBL-Mariner) Security Update for Open Secure Sockets Layer (OpenSSL) (6005)
  • 900910 Common Base Linux Mariner (CBL-Mariner) Security Update for Open Secure Sockets Layer (OpenSSL) (6779-1)
  • 91831 Microsoft Visual Studio Security Update - November 2021

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