rhsa-2020_2041
Vulnerability from csaf_redhat
Published
2020-05-06 13:53
Modified
2024-11-05 22:11
Summary
Red Hat Security Advisory: squid:4 security update
Notes
Topic
An update for the squid:4 module is now available for Red Hat Enterprise Linux 8.
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
Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.
Security Fix(es):
* squid: improper check for new member in ESIExpression::Evaluate allows for stack buffer overflow (CVE-2019-12519)
* squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code execution (CVE-2020-11945)
* squid: parsing of header Proxy-Authentication leads to memory corruption (CVE-2019-12525)
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.
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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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "squid: improper check for new member in ESIExpression::Evaluate allows for stack buffer overflow",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The squid packages are compiled with protections like stack canaries, which should reduce the chance of a successful exploitation dramatically and the most likely outcome is a crash without code execution.",
"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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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "squid: improper check for new member in ESIExpression::Evaluate allows for stack buffer overflow"
},
{
"cve": "CVE-2019-12525",
"cwe": {
"id": "CWE-119",
"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
},
"discovery_date": "2019-07-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1730535"
}
],
"notes": [
{
"category": "description",
"text": "An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token\u0027s value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "squid: parsing of header Proxy-Authentication leads to memory corruption",
"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-2019-12525"
},
{
"category": "external",
"summary": "RHBZ#1730535",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1730535"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-12525",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-12525"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-12525",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-12525"
},
{
"category": "external",
"summary": "http://www.squid-cache.org/Advisories/SQUID-2019_3.txt",
"url": "http://www.squid-cache.org/Advisories/SQUID-2019_3.txt"
}
],
"release_date": "2019-07-12T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-05-06T13:53:02+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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},
"url": "https://access.redhat.com/errata/RHSA-2020:2041"
},
{
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"details": "Remove \u0027auth_param digest ...\u0027 configuration settings from squid.conf.",
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"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.0"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "squid: parsing of header Proxy-Authentication leads to memory corruption"
},
{
"cve": "CVE-2020-11945",
"cwe": {
"id": "CWE-284",
"name": "Improper Access Control"
},
"discovery_date": "2020-04-16T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1827563"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Squid, where a remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This issue occurs because the attacker can overflow the nonce reference counter, which results in remote code execution if the pooled token credentials are freed.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code execution",
"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-2020-11945"
},
{
"category": "external",
"summary": "RHBZ#1827563",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1827563"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-11945",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-11945"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-11945",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11945"
},
{
"category": "external",
"summary": "http://www.squid-cache.org/Advisories/SQUID-2020_4.txt",
"url": "http://www.squid-cache.org/Advisories/SQUID-2020_4.txt"
}
],
"release_date": "2020-04-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-05-06T13:53:02+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2020:2041"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code execution"
}
]
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.