rhsa-2020_4756
Vulnerability from csaf_redhat
Published
2020-11-04 01:47
Modified
2024-09-16 04:23
Summary
Red Hat Security Advisory: varnish:6 security, bug fix, and enhancement update
Notes
Topic
An update for the varnish:6 module is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. 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
Varnish Cache is a high-performance HTTP accelerator. It stores web pages in memory so web servers don't have to create the same web page over and over again, giving the website a significant speed up.
The following packages have been upgraded to a later upstream version: varnish (6.0.6). (BZ#1795673)
Security Fix(es):
* varnish: denial of service handling certain crafted HTTP/1 requests (CVE-2019-15892)
* varnish: remote clients may cause Varnish to assert and restart which could result in DoS (CVE-2020-11653)
* varnish: not clearing pointer between two client requests leads to information disclosure (CVE-2019-20637)
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 8.3 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.
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"text": "Varnish Cache is a high-performance HTTP accelerator. It stores web pages in memory so web servers don\u0027t have to create the same web page over and over again, giving the website a significant speed up.\n\nThe following packages have been upgraded to a later upstream version: varnish (6.0.6). (BZ#1795673)\n\nSecurity Fix(es):\n\n* varnish: denial of service handling certain crafted HTTP/1 requests (CVE-2019-15892)\n\n* varnish: remote clients may cause Varnish to assert and restart which could result in DoS (CVE-2020-11653)\n\n* varnish: not clearing pointer between two client requests leads to information disclosure (CVE-2019-20637)\n\nFor 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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes linked from the References section.",
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"text": "1756079"
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"category": "description",
"text": "A flaw was found in the way Varnish parsed certain HTTP/1 requests. A remote attacker could use this flaw to crash Varnish by sending specially crafted multiple HTTP/1 requests processed on the same HTTP/1 keep-alive connection. This causes Varnish to restart with a clean cache, causing a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "varnish: denial of service handling certain crafted HTTP/1 requests",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is a remote denial of service flaw in varnish cache application. It causes varnish to restart, with a clean cache, since the purpose of varnish is to cache web pages thereby improving overall web server performance, an attacker can cause web performance to degrade due to this attack.",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-15892"
},
{
"category": "external",
"summary": "RHBZ#1756079",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1756079"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-15892",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-15892"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-15892",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15892"
},
{
"category": "external",
"summary": "https://varnish-cache.org/security/VSV00003.html",
"url": "https://varnish-cache.org/security/VSV00003.html"
}
],
"release_date": "2019-09-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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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"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2020:4756"
},
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"category": "workaround",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "varnish: denial of service handling certain crafted HTTP/1 requests"
},
{
"cve": "CVE-2019-20637",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
},
"discovery_date": "2019-11-13T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1772362"
}
],
"notes": [
{
"category": "description",
"text": "An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.1. It does not clear a pointer between the handling of one client request and the next request within the same connection. This sometimes causes information to be disclosed from the connection workspace, such as data structures associated with previous requests within this connection or VCL-related temporary headers.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "varnish: not clearing pointer between two client requests leads to information disclosure",
"title": "Vulnerability summary"
},
{
"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-2019-20637"
},
{
"category": "external",
"summary": "RHBZ#1772362",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1772362"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-20637",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-20637"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-20637",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20637"
}
],
"release_date": "2019-10-21T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
"version": "3.0"
},
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"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "varnish: not clearing pointer between two client requests leads to information disclosure"
},
{
"cve": "CVE-2020-11653",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2020-02-04T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1813867"
}
],
"notes": [
{
"category": "description",
"text": "An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before 6.3.2. It occurs when communication with a TLS termination proxy uses PROXY version 2. There can be an assertion failure and daemon restart, which causes a performance loss.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "varnish: remote clients may cause Varnish to assert and restart which could result in DoS",
"title": "Vulnerability summary"
},
{
"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-2020-11653"
},
{
"category": "external",
"summary": "RHBZ#1813867",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1813867"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-11653",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-11653"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-11653",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11653"
},
{
"category": "external",
"summary": "https://varnish-cache.org/security/VSV00005.html#vsv00005",
"url": "https://varnish-cache.org/security/VSV00005.html#vsv00005"
}
],
"release_date": "2020-02-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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-2020:4756"
},
{
"category": "workaround",
"details": "An user can mitigate the problem by setting the proxy protocol to version 1 on the TLS Proxy side, as this flaw only affects the proxy protocol version 2.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"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",
"version": "3.1"
},
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"AppStream-8.3.0.GA:varnish:6:8030020200530080205:30b713e6:varnish-modules-debugsource-0:0.15.0-5.module+el8.3.0+6843+b3b42fcc.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "varnish: remote clients may cause Varnish to assert and restart which could result in DoS"
}
]
}
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