CVE-2020-5236
Summary
| CVE | CVE-2020-5236 |
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| State | PUBLIC |
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| Assigner | [email protected] |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2020-02-04 03:15:00 UTC |
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| Updated | 2020-02-06 18:46:00 UTC |
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| Description | Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like "Bad-header: xxxxxxxxxxxxxxx\x10" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible. |
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NVD Known Affected Configurations (CPE 2.3)
References
| Reference | Source | Link | Tags |
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| Merge pull request from GHSA-73m2-3pwg-5fgc · Pylons/waitress@6e46f9e · GitHub |
MISC |
github.com |
Patch, Third Party Advisory |
| Catastrophic backtracking in regex allows Denial of Service · Advisory · Pylons/waitress · GitHub |
CONFIRM |
github.com |
Third Party Advisory |
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 296075 Oracle Solaris 11.4 Support Repository Update (SRU) 21.69.0 Missing (CPUAPR2020)
- 983116 Python (pip) Security Update for waitress (GHSA-73m2-3pwg-5fgc)
