CVE-2020-1935 (GCVE-0-2020-1935)

Vulnerability from cvelistv5 – Published: 2020-02-24 21:11 – Updated: 2024-08-04 06:53
VLAI
Summary
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
Severity
No CVSS data available.
CWE
  • HTTP Request Smuggling
Assigner
References
URL Tags
https://lists.apache.org/thread.html/r127f76181ac… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://lists.apache.org/thread.html/rc31cbabb46c… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r7bc994c965a… mailing-listx_refsource_MLIST
https://www.debian.org/security/2020/dsa-4673 vendor-advisoryx_refsource_DEBIAN
https://www.debian.org/security/2020/dsa-4680 vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujul2020.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020032… x_refsource_CONFIRM
https://lists.apache.org/thread.html/r441c1f30a25… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r660cd379afe… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd547be0c9d8… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra5dee390ad2… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r80e9c8417c7… mailing-listx_refsource_MLIST
https://usn.ubuntu.com/4448-1/ vendor-advisoryx_refsource_UBUNTU
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
https://lists.apache.org/thread.html/r9ce7918faf3… mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version
Apache Apache Tomcat Affected: Apache Tomcat 9.0.0.M1 to 9.0.30
Affected: 8.5.0 to 8.5.50
Affected: 7.0.0 to 7.0.99
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              "url": "https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6@%3Cdev.tomcat.apache.org%3E"
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    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2020-1935",
    "datePublished": "2020-02-24T21:11:38.000Z",
    "dateReserved": "2019-12-02T00:00:00.000Z",
    "dateUpdated": "2024-08-04T06:53:59.921Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
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    "epss": {
      "cve": "CVE-2020-1935",
      "date": "2026-05-28",
      "epss": "0.01366",
      "percentile": "0.8048"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-1935\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2020-02-24T22:15:11.980\",\"lastModified\":\"2024-11-21T05:11:38.730\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. 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Tal proxy inverso es considerado 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Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpujul2020.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2020.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.