Overview
- Description
- This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero. If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.
- Source
- security-officer@isc.org
- NVD status
- Modified
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 7.5
- Impact score
- 3.6
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity
- HIGH
Weaknesses
- nvd@nist.gov
- CWE-617
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
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"vulnerable": true,
"matchCriteriaId": "FC5F91EF-B660-42FF-9B48-880299C9A128",
"versionEndExcluding": "9.16.37",
"versionStartIncluding": "9.16.12"
},
{
"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"vulnerable": true,
"matchCriteriaId": "92119B97-ADE6-47C0-B3E2-3B05C08A0B99",
"versionEndExcluding": "9.18.11",
"versionStartIncluding": "9.18.0"
},
{
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"matchCriteriaId": "CB820E6D-F56C-4222-A3FF-3A02266FD68B",
"versionEndExcluding": "9.19.9",
"versionStartIncluding": "9.19.0"
},
{
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"vulnerable": true,
"matchCriteriaId": "1B20F152-D0C3-4F07-83B3-5EA6B116F005"
},
{
"criteria": "cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*",
"vulnerable": true,
"matchCriteriaId": "94661BA2-27F8-4FFE-B844-9404F735579D"
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{
"criteria": "cpe:2.3:a:isc:bind:9.16.14:s1:*:*:supported_preview:*:*:*",
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{
"criteria": "cpe:2.3:a:isc:bind:9.16.21:s1:*:*:supported_preview:*:*:*",
"vulnerable": true,
"matchCriteriaId": "751E37C2-8BFD-4306-95C1-8C01CE495FA4"
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{
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"vulnerable": true,
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{
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"operator": "OR"
}
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]