Denial of Service (DoS)
Detailed paths
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS) through the processing of malicious preflight requests that include a Access-Control-Request-Headers
header with excessive commas. An attacker can induce excessive memory consumption and potentially crash the server by sending specially crafted requests.
PoC
func BenchmarkPreflightAdversarialACRH(b *testing.B) {
resps := makeFakeResponses(b.N)
req, _ := http.NewRequest(http.MethodOptions, dummyEndpoint, nil)
req.Header.Add(headerOrigin, dummyOrigin)
req.Header.Add(headerACRM, http.MethodGet)
req.Header[headerACRH] = adversarialACRH
handler := Default().Handler(testHandler)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
handler.ServeHTTP(resps[i], req)
}
}
var adversarialACRH []string
func init() { // populates adversarialACRH
n := int(math.Floor(math.Sqrt(http.DefaultMaxHeaderBytes)))
commas := strings.Repeat(",", n)
res := make([]string, n)
for i := range res {
res[i] = commas
}
adversarialACRH = res
}
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
ws
package
Remediation
Upgrade github.com/rs/cors
to version 1.11.0 or higher.
References
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Detailed paths
Overview
github.com/Azure/azure-sdk-for-go/sdk/azidentity is a module that provides Microsoft Entra ID (formerly Azure Active Directory) token authentication support across the Azure SDK. It includes a set of TokenCredential implementations, which can be used with Azure SDK clients supporting token authentication.
Affected versions of this package are vulnerable to Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in the authentication process. An attacker can elevate privileges by exploiting race conditions during the token validation steps. This is only exploitable if the application is configured to use multiple threads or processes for handling authentication requests.
Notes:
An attacker who successfully exploited the vulnerability could elevate privileges and read any file on the file system with SYSTEM access permissions;
An attacker who successfully exploits this vulnerability can only obtain read access to the system files by exploiting this vulnerability. The attacker cannot perform write or delete operations on the files;
The vulnerability exists in the following credential types:
DefaultAzureCredential
andManagedIdentityCredential
;The vulnerability exists in the following credential types:
ManagedIdentityApplication
(.NET)
ManagedIdentityApplication
(Java)
ManagedIdentityApplication
(Node.js)
Remediation
Upgrade github.com/Azure/azure-sdk-for-go/sdk/azidentity
to version 1.6.0 or higher.
References
- GitHub Commit
- GitHub Commit
- GitHub Commit
- GitHub Commit
- GitHub Commit
- GitHub Commit
- GitHub Commit
- Microsoft Advisory
Template Injection
Detailed paths
Overview
dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG.
Affected versions of this package are vulnerable to Template Injection in purify.js
, due to inconsistencies in the parsing of XML and HTML tags. Executable code can be injected in HTML inside XML CDATA
blocks.
PoC
<![CDATA[ ><img src onerror=alert(1)> ]]>
Remediation
Upgrade dompurify
to version 2.4.9, 3.0.11 or higher.