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CVE-2020-5397

CSRF Attack via CORS Preflight Requests with Spring MVC or Spring WebFlux

Public exploit available. Not confirmed exploited in the wild yet. Fixed versions are out.

CVSS 3.15.3MediumEPSS percentile85th2.6% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
Public exploit: 1 sourceFix5 products2 fixed builds listed below
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Nuclei · 1 templateOpenVAS · 3 checks

e.g. Spring Framework CSRF via CORS Preflight · OID 1.3.6.1.4.1.25623.1.0.104252

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Published Updated Sources: CVE.org, NVD, GitHub, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Spring FrameworkAffected: ≥ 5.2, < v5.2.3.RELEASEUpgrade to: v5.2.3.RELEASEStated by: CVE record
  • Maven org.springframework:spring-webmvcAffected: ≥ 5.2.0, < 5.2.3Upgrade to: 5.2.3Stated by: GitHub advisory
  • Maven org.springframework:spring-webfluxAffected: ≥ 5.2.0, < 5.2.3Upgrade to: 5.2.3Stated by: GitHub advisory
  • Vmware Spring FrameworkAffected: ≥ 5.2.0, < 5.2.3Upgrade to: 5.2.3Stated by: NVD
  • Oracle Communications Diameter Signaling RouterAffected: ≥ 8.0.0, ≤ 8.2.2Upgrade to: after 8.2.2Stated by: NVD

Versions as the sources state them. 17 more products have version data. Full version matrix after sign-in

Check it yourselfA free Nuclei and OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Discuss checks for your systems with a specialist. Scope is agreed before testing.

What it is

From the CVE record

Spring Framework, versions 5.2.x prior to 5.2.3 are vulnerable to CSRF attacks through CORS preflight requests that target Spring MVC (spring-webmvc module) or Spring WebFlux (spring-webflux module) endpoints. Only non-authenticated endpoints are vulnerable because preflight requests should not include credentials and therefore requests should fail authentication. However a notable exception to this are Chrome based browsers when using client certificates for authentication since Chrome sends TLS client certificates in CORS preflight requests in violation of spec requirements. No HTTP body can be sent or received as a result of this attack.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS85th
Public exploit
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

1 source with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

2.6% chance of exploitation activity in the next 30 days, which ranks it in the 85th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

The patch came 471 days before any public exploit.

  1. OpenVAS check added
  2. Public exploit / PoCsource: othernuclei check added
  3. Patch availablerecord updated
  4. Publishedweakness classified, att&ck mapped

Affected products

And 33 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 5.3 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality NoneNo confidentiality impact
  • Integrity LowData modification is possible but limited in scope or consequence
  • Availability NoneNo availability impact

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 8 more references. See all after sign-in

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