Active Storage 5.2.0 content-disposition/content-type access control

Summaryinfo

A vulnerability marked as critical has been reported in Active Storage 5.2.0. This affects an unknown function. The manipulation of the argument content-disposition/content-type leads to access control. This vulnerability is referenced as CVE-2018-16477. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Active Storage 5.2.0 and classified as critical. This issue affects an unknown code. The manipulation of the argument content-disposition/content-type with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the `content-disposition` and `content-type` parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path.

The bug was discovered 11/27/2018. The weakness was published 11/30/2018 (Website). It is possible to read the advisory at groups.google.com. The identification of this vulnerability is CVE-2018-16477 since 09/04/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277631 (Fedora Security Update for rubygem-activestorage (FEDORA-2019-307ebe924c)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Active Storage

Version

• 5.2.0

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion