It was found that curl and libcurl might send their Authentication header to a third party HTTP server upon receiving an HTTP REDIRECT reply. This could leak authentication token to external entities.
Find out more about CVE-2018-1000007 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the versions of curl as shipped with Red Hat Enterprise Linux 5, 6, and 7, as well as the versions of httpd24-curl as shipped with Red Hat Software Collections. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
| CVSS3 Base Score | 4.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (curl) | RHSA-2018:3157 | 2018-10-30 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (httpd24-curl) | RHSA-2018:3558 | 2018-11-13 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (httpd24-curl) | RHSA-2018:3558 | 2018-11-13 |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Core Services 1 | curl | Will not fix |
| Red Hat Enterprise Linux 6 | curl | Will not fix |
| Red Hat Enterprise Linux 5 | curl | Will not fix |
| Red Hat Ceph Storage 2 | curl | Not affected |
| .NET Core 2.0 on Red Hat Enterprise Linux | rh-dotnet20-curl | Will not fix |
| .NET Core 2.0 on Red Hat Enterprise Linux | rh-dotnet21-curl | Will not fix |
| .NET Core 1.0 on Red Hat Enterprise Linux | rh-dotnetcore10-curl | Will not fix |
| .NET Core 1.0 on Red Hat Enterprise Linux | rh-dotnetcore11-curl | Will not fix |
By default, curl and libcurl will not follow redirect requests.
This flaw happens only when curl or libcurl are explicitly requested to follow redirects (option --location in curl, and CURLOPT_FOLLOWLOCATION in libcurl).
To mitigate this, it is possible to prevent the automated following of redirects, replacing it by manual redirects (and remove the authentication header), for example.
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