CVE-2020-25686
CVSS V2 Medium 4.3
CVSS V3 Low 3.7
Description
A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Overview
- CVE ID
- CVE-2020-25686
- Assigner
- secalert@redhat.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-01-20T17:15:13
- Last Modified Date
- 2022-02-14T15:29:32
Weakness Enumerations
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:10.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | 1 | OR | 4.21 | 4.21.14m |
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | 1 | OR | 4.22 | 4.22.9m |
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | 1 | OR | 4.23 | 4.23.7m |
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | 1 | OR | 4.24 | 4.24.5m |
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | 1 | OR | 4.25 | 4.25.2f |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4.3
- Severity
- MEDIUM
- Exploitability Score
- 8.6
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 3.7
- Base Severity
- LOW
- Exploitability Score
- 2.2
- Impact Score
- 1.4
References
| Reference URL | Reference Tags |
|---|---|
| https://www.jsof-tech.com/disclosures/dnspooq/ | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1890125 | 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://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-25686 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25686 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:32:49 | Added to TrackCVE | |||
| 2022-12-05 20:34:52 | 2021-01-20T17:15Z | 2021-01-20T17:15:13 | CVE Published Date | updated |
| 2022-12-05 20:34:52 | 2022-02-14T15:29:32 | CVE Modified Date | updated | |
| 2022-12-05 20:34:52 | Analyzed | Vulnerability Status | updated |