Incorrect MAC key used in the RC4-MD5 ciphersuite (CVE-2022-1434)
Published Last modified Sources: Siemens ProductCERT, Ubuntu, CVE.org, OSV
What is affected, what to do
The OpenSSL 3.0 implementation of the RC4-MD5 ciphersuite incorrectly uses the AAD data as the MAC key. This makes the MAC key trivially predictable.
Update openssl to version 3.0.3.
- Affected
- OpenSSL
eq Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2)..Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2)
- OpenSSL
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Metrics
5.9
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
5.9
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: Siemens ProductCERT, Ubuntu, CVE.org, OSV
1.2 %
EPSS score
Moderate — model estimates 1-10% exploitation likelihood.
Source: FIRST EPSS, percentile 68.8
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 68.13 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 5.9 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 5.9
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 1.2 %
- Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 68.8
- High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
The OpenSSL 3.0 implementation of the RC4-MD5 ciphersuite incorrectly uses the AAD data as the MAC key. This makes the MAC key trivially predictable. An attacker could exploit this issue by performing a man-in-the-middle attack to modify data being sent from one endpoint to an OpenSSL 3.0 recipient such that the modified data would still pass the MAC integrity check. Note that data sent from an OpenSSL 3.0 endpoint to a non-OpenSSL 3.0 endpoint will always be rejected by the recipient and the connection will fail at that point. Many application protocols require data to be sent from the client to the server first. Therefore, in such a case, only an OpenSSL 3.0 server would be impacted when talking to a non-OpenSSL 3.0 client. If both endpoints are OpenSSL 3.0 then the attacker could modify data being sent in both directions. In this case both clients and servers could be affected, regardless of the application protocol. Note that in the absence of an attacker this bug means that an OpenSSL 3.0 endpoint communicating with a non-OpenSSL 3.0 endpoint will fail to complete the handshake when using this ciphersuite. The confidentiality of data is not impacted by this issue, i.e. an attacker cannot decrypt data that has been encrypted using this ciphersuite - they can only modify it. In order for this attack to work both endpoints must legitimately negotiate the RC4-MD5 ciphersuite. This ciphersuite is not compiled by default in OpenSSL 3.0, and is not available within the default provider or the default ciphersuite list. This ciphersuite will never be used if TLSv1.3 has been negotiated. In order for an OpenSSL 3.0 endpoint to use this ciphersuite the following must have occurred: 1) OpenSSL must have been compiled with the (non-default) compile time option enable-weak-ssl-ciphers 2) OpenSSL must have had the legacy provider explicitly loaded (either through application code or via configuration) 3) The ciphersuite must have been explicitly added to the ciphersuite list 4) The libssl security level must have been set to 0 (default is 1) 5) A version of SSL/TLS below TLSv1.3 must have been negotiated 6) Both endpoints must negotiate the RC4-MD5 ciphersuite in preference to any others that both endpoints have in common Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2).
Source: siemens_advisory, Ubuntu Security Notices, cvelistv5, NVD (NIST), OSV (Open Source Vulnerabilities)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| OpenSSL | OpenSSL |
|
|
| netapp | active_iq_unified_manager |
|
|
| netapp | clustered_data_ontap |
|
|
| netapp | clustered_data_ontap_antivirus_connector |
|
|
| netapp | santricity_smi-s_provider |
|
|
| netapp | smi-s_provider |
|
|
| netapp | snapmanager |
|
|
| netapp | solidfire\,_enterprise_sds_\&_hci_storage_node |
|
|
| netapp | solidfire_\&_hci_management_node |
|
|
| openssl | openssl |
|
|
Vendors and products
- NetApp A250 Firmware
- NetApp A700s Firmware
- NetApp Active IQ Unified Manager
- NetApp Aff 500f Firmware
- NetApp Aff 8300 Firmware
- NetApp Aff 8700 Firmware
- NetApp Aff A400 Firmware
- NetApp FreeBSD
- NetApp Clustered Data Ontap Antivirus Connector
- NetApp Fabric-attached Storage A400 Firmware
- NetApp Fas 500f Firmware
- NetApp Fas 8300 Firmware
Affected operating systems
| Linux | ubuntu | openssl | bionic |
| Linux | ubuntu | openssl | focal |
| Linux | ubuntu | openssl | impish |
| Linux | ubuntu | openssl | jammy |
| Linux | ubuntu | openssl1.0 | bionic |
| Other | netapp | a250_firmware | — |
| Other | netapp | a700s_firmware | — |
| Other | netapp | aff_500f_firmware | — |
| Other | netapp | aff_8300_firmware | — |
| Other | netapp | aff_8700_firmware | — |
| Other | netapp | aff_a400_firmware | — |
| Other | netapp | fabric-attached_storage_a400_firmware | — |
| Other | netapp | fas_500f_firmware | — |
| Other | netapp | fas_8300_firmware | — |
| Other | netapp | fas_8700_firmware | — |
| Other | netapp | h300e_firmware | — |
| Other | netapp | h300s_firmware | — |
| Other | netapp | h410s_firmware | — |
| Other | netapp | h500e_firmware | — |
| Other | netapp | h500s_firmware | — |
| Other | netapp | h700e_firmware | — |
| Other | netapp | h700s_firmware | — |
References & sources
- crates.iocrates/openssl-srcpackage
- rustsec.orgadvisories/RUSTSEC-2022-0026.htmladvisory
- openssl.orgnews/secadv/20220503.txtweb
- git.openssl.orggitweb/?p=openssl.git;a=commitdiff;h=7d56a74a96828985db7354a552…
- security.netapp.comadvisory/ntap-20220602-0009
- Siemens ProductCERTproductcert/pdf/ssa-953464.pdf
- NVD (NIST)vuln/detail/CVE-2022-1434advisory
- github.comgithub/advisory-database/issues/405web
- git.openssl.orggitweb/?p=openssl.git;a=commitdiff;h=7d56a74a96828985db7354a552…web
- security.netapp.comadvisory/ntap-20220602-0009web
- Siemens ProductCERTproductcert/html/ssa-953464.html
- Siemens ProductCERTproductcert/html/ssa-794697.html
- Siemens ProductCERTproductcert/html/ssa-398330.html
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedopenssl.org
Show 10 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://cert-portal.siemens.com/productcert/pdf/ssa-953464.pdfReference added —https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=7d56a74a96828985db7354a55227a511615f732bReference added —https://security.netapp.com/advisory/ntap-20220602-0009/Reference added —https://www.openssl.org/news/secadv/20220503.txtReference removed https://cert-portal.siemens.com/productcert/pdf/ssa-953464.pdf—Reference removed https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=7d56a74a96828985db7354a55227a511615f732b—Reference removed https://security.netapp.com/advisory/ntap-20220602-0009/—Reference removed https://www.openssl.org/news/secadv/20220503.txt—Reference type removed https://security.netapp.com/advisory/ntap-20220602-0009/ Types: Third Party Advisory—Reference type removed https://www.openssl.org/news/secadv/20220503.txt Types: Vendor Advisory—Source identifier: openssl-security@openssl.org
Record modifiedCVE Program
Show 10 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://cert-portal.siemens.com/productcert/pdf/ssa-953464.pdfReference added —https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=7d56a74a96828985db7354a55227a511615f732bReference added —https://security.netapp.com/advisory/ntap-20220602-0009/Reference added —https://www.openssl.org/news/secadv/20220503.txtReference removed https://cert-portal.siemens.com/productcert/pdf/ssa-953464.pdf—Reference removed https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=7d56a74a96828985db7354a55227a511615f732b—Reference removed https://security.netapp.com/advisory/ntap-20220602-0009/—Reference removed https://www.openssl.org/news/secadv/20220503.txt—Reference type removed https://security.netapp.com/advisory/ntap-20220602-0009/ Types: Third Party Advisory—Reference type removed https://www.openssl.org/news/secadv/20220503.txt Types: Vendor Advisory—Source identifier: af854a3a-2127-422b-91ae-364da2661108
Record modifiedSiemens ADP
Show 4 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2022/1xxx/CVE-2022-1434.json">CVE-2022-1434</a>Reference added —https://cert-portal.siemens.com/productcert/html/ssa-398330.htmlReference added —https://cert-portal.siemens.com/productcert/html/ssa-794697.htmlReference added —https://cert-portal.siemens.com/productcert/html/ssa-953464.htmlSource identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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<a href="https://intel.neosec.eu/en/cve/CVE-2022-1434"><img src="https://intel.neosec.eu/badge/cve/CVE-2022-1434.svg?lang=en" alt="CVE-2022-1434 – NEOSEC Intel" height="20"></a>