{"id":56659,"date":"2025-07-02T22:07:36","date_gmt":"2025-07-02T22:07:36","guid":{"rendered":""},"modified":"2025-09-06T12:12:34","modified_gmt":"2025-09-06T18:12:34","slug":"cve-2025-52477-unauthenticated-ssrf-vulnerability-in-octo-sts-github-app","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-52477-unauthenticated-ssrf-vulnerability-in-octo-sts-github-app\/","title":{"rendered":"CVE-2025-52477: Unauthenticated SSRF Vulnerability in Octo-STS GitHub App<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-52477 is a critical vulnerability found in the Octo-STS GitHub App. This vulnerability allows for unauthenticated Server Side Request Forgery (SSRF), posing a significant threat to the integrity and confidentiality of data. It affects all Octo-STS versions before v0.5.3, making it a pressing concern for a wide array of users.
\nThis vulnerability matters because it can lead to potential<\/a> system compromise or data leakage. Malicious actors can misuse OpenID Connect tokens to trigger internal network requests that reflect sensitive information<\/a>. Thus, it is crucial for users and system administrators to understand the ramifications and steps to mitigate this vulnerability.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-52477
\nSeverity: High (CVSS: 8.6)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Octo-STS GitHub App | All versions before v0.5.3<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability exploits a flaw in the Octo-STS GitHub app, where unauthenticated SSRF<\/a> can be triggered by abusing fields in OpenID Connect tokens. An attacker can craft a malicious token<\/a> to initiate internal network requests. These requests can then reflect error logs containing sensitive information, leading to potential system<\/a> compromise or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a conceptual example of how the vulnerability might be exploited. This pseudocode represents a malicious payload that an attacker could use to trigger the vulnerability<\/a>.<\/p>\n

POST \/sts\/token HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"openid\": {\n\"nonce\": \"malicious_network_request\",\n\"audience\": \"internal_service\",\n\"issuer\": \"attacker_controlled_domain\"\n}\n}<\/code><\/pre>\n
In this example, the attacker manipulates the nonce and audience fields to trigger an internal network request to the “internal_service”. The “issuer” is set to an attacker-controlled domain, allowing the attacker to receive and exploit the reflected sensitive information<\/a>.
\nIt is important to note that this is a simplified representation of the exploit, and actual exploits may involve additional steps and complexities.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-52477 is a critical vulnerability found in the Octo-STS GitHub App. This vulnerability allows for unauthenticated Server Side Request Forgery (SSRF), posing a significant threat to the integrity and confidentiality of data. It affects all Octo-STS versions before v0.5.3, making it a pressing concern for a wide array of users. This vulnerability matters because […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[79],"product":[],"attack_vector":[101],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56659","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-github","attack_vector-ssrf"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t