rhsa-2021_0150
Vulnerability from csaf_redhat
Published
2021-01-19 15:06
Modified
2024-11-05 23:12
Summary
Red Hat Security Advisory: dnsmasq security update
Notes
Topic
An update for dnsmasq 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
The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.
Security Fix(es):
* dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681)
* dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682)
* dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683)
* dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684)
* dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685)
* dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686)
* dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687)
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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},
{
"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.",
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"title": "dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker"
},
{
"acknowledgments": [
{
"names": [
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"title": "Vulnerability description"
},
{
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"text": "dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker",
"title": "Vulnerability summary"
},
{
"category": "other",
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"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.",
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"details": "Moderate"
}
],
"title": "dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker"
},
{
"acknowledgments": [
{
"names": [
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"Shlomi Oberman"
],
"organization": "JSOF"
}
],
"cve": "CVE-2020-25687",
"cwe": {
"id": "CWE-122",
"name": "Heap-based Buffer Overflow"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1891568"
}
],
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{
"category": "description",
"text": "A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the versions of dnsmasq as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they are not compiled with DNSSEC support.",
"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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"url": "https://www.cve.org/CVERecord?id=CVE-2020-25687"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25687",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25687"
},
{
"category": "external",
"summary": "https://www.jsof-tech.com/disclosures/dnspooq/",
"url": "https://www.jsof-tech.com/disclosures/dnspooq/"
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"release_date": "2021-01-19T00:00:00+00:00",
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"date": "2021-01-19T15:06:28+00:00",
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"title": "dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled"
}
]
}
Loading...
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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.