bootstrap-sass 3.2.0.3 Rubygems __cfduid code injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in bootstrap-sass 3.2.0.3. This affects an unknown part of the component Rubygems Handler. The manipulation of the argument __cfduid as part of Cookie leads to code injection. This vulnerability is traded as CVE-2019-10842. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in bootstrap-sass 3.2.0.3. This issue affects an unknown functionality of the component Rubygems Handler. The manipulation of the argument __cfduid as part of a Cookie leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Arbitrary code execution (via backdoor code) was discovered in bootstrap-sass 3.2.0.3, when downloaded from rubygems.org. An unauthenticated attacker can craft the ___cfduid cookie value with base64 arbitrary code to be executed via eval(), which can be leveraged to execute arbitrary code on the target system. Note that there are three underscore characters in the cookie name. This is unrelated to the __cfduid cookie that is legitimately used by Cloudflare.

The bug was discovered 03/26/2019. The weakness was shared 04/04/2019. The identification of this vulnerability is CVE-2019-10842 since 04/03/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 9 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 371742 (Bootstrap-Sass Remote Code Execution Vulnerability).

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

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• bootstrap-sass

Version

• 3.2.0.3

CPE 2.3info

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CPE 2.2info

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