CVE-2023-26735: Withdrawn Advisory Access Control Issues Vulnerability
HIGHCVE-2023-26735 is a HIGH (CVSS 7.5) access control issues vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Withdrawn Advisory libraries in the Go ecosystem. The issue involves access control issues in blackbox_exporter. Remediation is available in the latest vendor maintenance releases.
CVE-2023-26735 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
How to Fix CVE-2023-26735
To remediate this vulnerability, upgrade all affected Withdrawn Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/prometheus/blackbox_exporter to Latest secure releaseRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/prometheus/blackbox_exporterHow to Check if You Are Affected
To determine whether your application is affected by CVE-2023-26735, inspect your project dependencies for Withdrawn Advisory:
inspect dependencies for github.com/prometheus/blackbox_exporterAnalyze the terminal output to locate any version of Withdrawn Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Withdrawn Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2023-26735 Affected Withdrawn Advisory Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/prometheus/blackbox_exporter
|
Go |
≤ 0.23.0
|
|
References
Frequently Asked Questions
What is CVE-2023-26735?
Which Withdrawn Advisory versions are affected?
What version fixes CVE-2023-26735?
Is github.com/prometheus/blackbox_exporter affected?
What is the CVSS score of CVE-2023-26735?
What CWE is associated with CVE-2023-26735?
How can I check Go dependencies for CVE-2023-26735?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-939c-3g97-vpvv",
"modified" : "2025-02-04T21:22:40Z",
"published" : "2023-04-26T00:30:21Z",
"withdrawn" : "2025-02-04T21:22:40Z",
"aliases" : [ "CVE-2023-26735" ],
"summary" : "Withdrawn Advisory: Access control issues in blackbox_exporter",
"details" : "# Withdrawn Advisory\nThis advisory has been withdrawn because it was determined to be a configuration issue rather than a vulnerability. This link is maintained to preserve external references. For more information, see the conversation [here](https://github.com/prometheus/blackbox_exporter/issues/1024#issuecomment-1449145854).\n\n# Original Advisory\nblackbox_exporter v0.23.0 was discovered to contain an access control issue in its probe interface. This vulnerability allows attackers to detect intranet ports and services, as well as download resources.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/prometheus/blackbox_exporter"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"last_affected" : "0.23.0"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-26735"
}, {
"type" : "WEB",
"url" : "https://github.com/prometheus/blackbox_exporter/issues/1024"
}, {
"type" : "WEB",
"url" : "https://github.com/prometheus/blackbox_exporter/issues/1025"
}, {
"type" : "WEB",
"url" : "https://github.com/prometheus/blackbox_exporter/issues/1026"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/prometheus/blackbox_exporter"
}, {
"type" : "WEB",
"url" : "https://github.com/prometheus/blackbox_exporter#tls-and-basic-authentication"
}, {
"type" : "WEB",
"url" : "http://blackboxexporter.com"
}, {
"type" : "WEB",
"url" : "http://prometheus.com"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-918" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2023-04-26T15:56:45Z",
"nvd_published_at" : "2023-04-26T00:15:09Z"
}
}