rhsa-2021_1610
Vulnerability from csaf_redhat
Published
2021-05-18 15:28
Modified
2024-11-05 23:33
Summary
Red Hat Security Advisory: curl security and bug fix update
Notes
Topic
An update for curl 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
The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.
Security Fix(es):
* curl: FTP PASV command response can cause curl to connect to arbitrary host (CVE-2020-8284)
* curl: Malicious FTP server can trigger stack overflow when CURLOPT_CHUNK_BGN_FUNCTION is used (CVE-2020-8285)
* curl: Inferior OCSP verification (CVE-2020-8286)
* curl: Expired pointer dereference via multi API with CURLOPT_CONNECT_ONLY option set (CVE-2020-8231)
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 8.4 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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-8284"
},
{
"category": "external",
"summary": "RHBZ#1902667",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1902667"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-8284",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-8284"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-8284",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8284"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2020-8284.html",
"url": "https://curl.se/docs/CVE-2020-8284.html"
}
],
"release_date": "2020-12-09T08:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-05-18T15:28:08+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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"url": "https://access.redhat.com/errata/RHSA-2021:1610"
},
{
"category": "workaround",
"details": "This flaw can be mitigated in curl as shipped with Red Hat Enterprise Linux and Red Hat Software Collections when using curl by passing the `--ftp-skip-pasv-ip` command line option to curl. For usage of libcurl, set `CURLOPT_FTP_SKIP_PASV_IP` to `1L`[1]. Note that these mitigations could cause problems in the uncommon instance that the server needs the client to connect back to an IP other than the control connection IP address.\n\n1. https://curl.se/libcurl/c/CURLOPT_FTP_SKIP_PASV_IP.html",
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{
"cvss_v3": {
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "curl: FTP PASV command response can cause curl to connect to arbitrary host"
},
{
"acknowledgments": [
{
"names": [
"Varnavas Papaioannou"
]
}
],
"cve": "CVE-2020-8285",
"cwe": {
"id": "CWE-121",
"name": "Stack-based Buffer Overflow"
},
"discovery_date": "2020-11-30T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1902687"
}
],
"notes": [
{
"category": "description",
"text": "Libcurl offers a wildcard matching functionality, which allows a callback (set with `CURLOPT_CHUNK_BGN_FUNCTION`) to return information back to libcurl on how to handle a specific entry in a directory when libcurl iterates over a list of all available entries. When this callback returns `CURL_CHUNK_BGN_FUNC_SKIP`, to tell libcurl to not deal with that file, the internal function in libcurl then calls itself recursively to handle the next directory entry. If there\u0027s a sufficient amount of file entries and if the callback returns \"skip\" enough number of times, libcurl runs out of stack space. The exact amount will of course vary with platforms, compilers and other environmental factors.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "curl: Malicious FTP server can trigger stack overflow when CURLOPT_CHUNK_BGN_FUNCTION is used",
"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-2020-8285"
},
{
"category": "external",
"summary": "RHBZ#1902687",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1902687"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-8285",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-8285"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-8285",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8285"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2020-8285.html",
"url": "https://curl.se/docs/CVE-2020-8285.html"
},
{
"category": "external",
"summary": "https://github.com/curl/curl/issues/6255",
"url": "https://github.com/curl/curl/issues/6255"
}
],
"release_date": "2020-12-09T08:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-05-18T15:28:08+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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{
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "curl: Malicious FTP server can trigger stack overflow when CURLOPT_CHUNK_BGN_FUNCTION is used"
},
{
"cve": "CVE-2020-8286",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2020-12-09T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1906096"
}
],
"notes": [
{
"category": "description",
"text": "Libcurl offers \"OCSP stapling\" via the CURLOPT_SSL_VERIFYSTATUS option. When set, libcurl verifies the OCSP response that a server responds with as part of the TLS handshake. It then aborts the TLS negotiation if something is wrong with the response. The same feature can be enabled with --cert-status using the curl tool. As part of the OCSP response verification, a client should verify that the response is indeed set out for the correct certificate. This step was not performed by libcurl when built or told to use OpenSSL as TLS backend.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "curl: Inferior OCSP verification",
"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-2020-8286"
},
{
"category": "external",
"summary": "RHBZ#1906096",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1906096"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-8286",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-8286"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-8286",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8286"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2020-8286.html",
"url": "https://curl.se/docs/CVE-2020-8286.html"
}
],
"release_date": "2020-12-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-05-18T15:28:08+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": {
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},
"url": "https://access.redhat.com/errata/RHSA-2021:1610"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"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:N",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "curl: Inferior OCSP verification"
}
]
}
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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.