CVE-2020-25687

CVSS V2 High 7.1 CVSS V3 Medium 5.9
Description
A flaw was found in dnsmasq before version 2.83. 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.
Overview
  • CVE ID
  • CVE-2020-25687
  • Assigner
  • secalert@redhat.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-01-20T17:15:13
  • Last Modified Date
  • 2021-03-26T18:40:39
Weakness Enumerations
CWE URL
CWE-122 http://cwe.mitre.org/data/definitions/122.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* 1 OR 2.83
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:N/I:N/A:C
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 7.1
  • Severity
  • HIGH
  • Exploitability Score
  • 8.6
  • Impact Score
  • 6.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • HIGH
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 5.9
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 2.2
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://www.jsof-tech.com/disclosures/dnspooq/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1891568 Issue Tracking Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/ Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202101-17 Third Party Advisory
https://www.debian.org/security/2021/dsa-4844 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/ Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html Mailing List Third Party Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2020-25687
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25687
History
Created Old Value New Value Data Type Notes
2022-05-10 07:18:33 Added to TrackCVE
2022-12-05 20:34:56 2021-01-20T17:15Z 2021-01-20T17:15:13 CVE Published Date updated
2022-12-05 20:34:56 2021-03-26T18:40:39 CVE Modified Date updated
2022-12-05 20:34:56 Analyzed Vulnerability Status updated