RHSA-2020:4004
Vulnerability from csaf_redhat - Published: 2020-09-29 19:54 - Updated: 2026-11-07 05:24Summary
Red Hat Security Advisory: tomcat security and bug fix update
Severity
Important
Notes
Topic: An update for tomcat is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.
Security Fix(es):
* tomcat: multiple requests with invalid payload length in a WebSocket frame could lead to DoS (CVE-2020-13935)
* tomcat: session fixation when using FORM authentication (CVE-2019-17563)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.9 Release Notes linked from the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
It was found that tomcat's FORM authentication allowed a very small period in which an attacker could possibly force a victim to use a valid user session, or Session Fixation. While practical exploit of this issue is deemed highly improbable, an abundance of caution merits it be considered a flaw. The highest threat from this vulnerability is to system availability, but also threatens data confidentiality and integrity.
7.5 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Client-7.9:tomcat-0:7.0.76-15.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-7.9:tomcat-servlet-3.0-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-admin-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-docs-webapp-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-el-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-javadoc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-jsp-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-jsvc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-lib-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Client-optional-7.9:tomcat-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-7.9:tomcat-0:7.0.76-15.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-7.9:tomcat-servlet-3.0-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-admin-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-docs-webapp-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-el-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-javadoc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-jsp-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-jsvc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-lib-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7ComputeNode-optional-7.9:tomcat-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-0:7.0.76-15.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-admin-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-el-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-jsp-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-lib-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-servlet-3.0-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-7.9:tomcat-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-admin-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-docs-webapp-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-el-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-javadoc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-jsp-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-jsvc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-lib-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-optional-7.9:tomcat-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-0:7.0.76-15.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-admin-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-el-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-jsp-2.2-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-lib-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-servlet-3.0-api-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-7.9:tomcat-webapps-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-optional-7.9:tomcat-docs-webapp-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-optional-7.9:tomcat-javadoc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-optional-7.9:tomcat-jsvc-0:7.0.76-15.el7.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Low
A flaw was found in Apache Tomcat, where the payload length in a WebSocket frame was not correctly validated. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service. The highest threat from this vulnerability is to system availability.
7.5 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2019-17563
Threats
Impact
Important
References
28 references
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{
"cve": "CVE-2019-17563",
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"id": "CWE-384",
"name": "Session Fixation"
},
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"ids": [
{
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"text": "1785711"
}
],
"notes": [
{
"category": "description",
"text": "It was found that tomcat\u0027s FORM authentication allowed a very small period in which an attacker could possibly force a victim to use a valid user session, or Session Fixation. While practical exploit of this issue is deemed highly improbable, an abundance of caution merits it be considered a flaw. The highest threat from this vulnerability is to system availability, but also threatens data confidentiality and integrity.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "tomcat: Session fixation when using FORM authentication",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "All affected Red Hat products providing the affected component code should update their setups per the product fixes given.\n\nThe following Red Hat products are out of support scope for Low Impact flaws, and as such will not issue security fixes:\nRed Hat Enterprise Linux 5\nRed Hat Enterprise Linux 6\nRed Hat JBoss BPM Suite 6\nRed Hat JBoss BRMS 6",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
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"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-17563"
},
{
"category": "external",
"summary": "http://mail-archives.apache.org/mod_mbox/www-announce/201912.mbox/%3C21b7a375-7297-581b-1f8e-06622d36775b@apache.org%3E",
"url": "http://mail-archives.apache.org/mod_mbox/www-announce/201912.mbox/%3C21b7a375-7297-581b-1f8e-06622d36775b@apache.org%3E"
},
{
"category": "external",
"summary": "http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.30",
"url": "http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.30"
},
{
"category": "external",
"summary": "https://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.99",
"url": "https://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.99"
},
{
"category": "external",
"summary": "https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.50",
"url": "https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.50"
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],
"release_date": "2019-12-18T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2020-09-29T19:54:04+00:00",
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"baseScore": 7.5,
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"title": "tomcat: Session fixation when using FORM authentication"
},
{
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"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2020-07-15T00:00:00+00:00",
"ids": [
{
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"text": "1857024"
}
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"notes": [
{
"category": "description",
"text": "A flaw was found in Apache Tomcat, where the payload length in a WebSocket frame was not correctly validated. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "tomcat: multiple requests with invalid payload length in a WebSocket frame could lead to DoS",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Certificate System 10.0 as well as Red Hat Enterprise Linux 8\u0027s Identity Management, are using a vulnerable version of Tomcat, bundled into the pki-servlet-engine component. However, there is no entry point for WebSockets, thus it is not possible to trigger the flaw in a supported setup. A future update may fix the code. Similarly, Red Hat OpenStack Platform 13 does not ship with WebSocket functionality enabled by default.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-13935"
},
{
"category": "external",
"summary": "RHBZ#1857024",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1857024"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-13935",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-13935"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-13935",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-13935"
},
{
"category": "external",
"summary": "http://mail-archives.apache.org/mod_mbox/tomcat-announce/202007.mbox/%3C39e4200c-6f4e-b85d-fe4b-a9c2bd5fdc3d%40apache.org%3E",
"url": "http://mail-archives.apache.org/mod_mbox/tomcat-announce/202007.mbox/%3C39e4200c-6f4e-b85d-fe4b-a9c2bd5fdc3d%40apache.org%3E"
},
{
"category": "external",
"summary": "http://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.0.0-M7",
"url": "http://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.0.0-M7"
},
{
"category": "external",
"summary": "http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.105",
"url": "http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.105"
},
{
"category": "external",
"summary": "http://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.57",
"url": "http://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.57"
},
{
"category": "external",
"summary": "http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.37",
"url": "http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.37"
}
],
"release_date": "2020-07-15T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-09-29T19:54:04+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2020:4004"
},
{
"category": "workaround",
"details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.",
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"threats": [
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"category": "impact",
"details": "Important"
}
],
"title": "tomcat: multiple requests with invalid payload length in a WebSocket frame could lead to DoS"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.