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CVE-2021-22876

Published: 31 March 2021

curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

Notes

AuthorNote
alexmurray
affects curl versions between 7.1.1 and 7.75.0

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
bionic
Released (7.58.0-2ubuntu3.13)
focal
Released (7.68.0-1ubuntu2.5)
groovy
Released (7.68.0-1ubuntu4.3)
hirsute
Released (7.74.0-1ubuntu2)
trusty
Released (7.35.0-1ubuntu2.20+esm7)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (7.47.0-1ubuntu2.19)
Patches:
vendor: https://curl.se/XOXep4o2CSG0.patch

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N