CVE-2025-20743

Description

In clkdbg, there is a possible escalation of privilege due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10136671; Issue ID: MSV-4651.

CVSS Details

CVSS Score

4.2

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

Configurations (Affected Products)

cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:google:android:16.0:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:mediatek:mt2718:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6761:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6765:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6768:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:* - NOT VULNERABLE

MediaTek clkdbg (具体版本需查阅官方安全公告)

受影响的芯片平台包括但不限于搭载MediaTek处理器的移动设备

使用clkdbg调试功能的Android/Linux嵌入式系统

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-20743 PoC Concept (概念性代码)
// Note: This is a conceptual demonstration only
// Actual exploitation requires specific MediaTek device environment

/*
#include <stdio.h>
#include <stdlib.h>

// Simulated clkdbg structure
struct clk_debug_entry {
    void* clock_data;
    int ref_count;
    void (*callback)(void*);
};

// Vulnerable function demonstrating UAF condition
void trigger_uaf_condition() {
    struct clk_debug_entry* entry = malloc(sizeof(struct clk_debug_entry));
    entry->clock_data = malloc(256);
    entry->callback = free; // Store free function pointer
    entry->ref_count = 1;
    
    // Simulate clock operation that triggers cleanup
    if (entry->ref_count == 0) {
        free(entry->clock_data); // First free
        // UAF: entry pointer still accessible but memory freed
    }
    
    // UAF: Accessing freed memory
    entry->callback(entry->clock_data); // Double-free condition
}

// Note: Actual PoC requires specific kernel module interaction
// and MediaTek proprietary components access
*/

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-20743
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-20743
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-20743/
[4] VulDB https://vuldb.com/cve/CVE-2025-20743
[5] https://corp.mediatek.com/product-security-bulletin/November-2025

Raw JSON Data

JSON

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Patch ID: ALPS10136671; Issue ID: MSV-4651."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L", "baseScore": 4.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 0.8, "impactScore": 3.4}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L", "baseScore": 4.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 0.8, "impactScore": 3.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:*", "matchCriteriaId": "2700BCC5-634D-4EC6-AB67-5B678D5F951D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:*", "matchCriteriaId": "8538774C-906D-4B03-A3E7-FA7A55E0DA9E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:*:*:*:*:*:*:*", "matchCriteriaId": "2D49E611-5D53-479D-A981-42388FDC0E8D"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt2718:-:*:*:*:*:*:*:*", "matchCriteriaId": "F5506327-7DDF-4E88-9EA8-10B8E32F848B"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6761:-:*:*:*:*:*:*:*", "matchCriteriaId": "F726F486-A86F-4215-AD93-7A07A071844A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6765:-:*:*:*:*:*:*:*", "matchCriteriaId": "43E779F6-F0A0-4153-9A1D-B715C3A2F80E"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6768:-:*:*:*:*:*:*:*", "matchCriteriaId": "06CD97E1-8A76-48B4-9780-9698EF5A960F"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:*", "matchCriteriaId": "C4EEE021-6B2A-47A0-AC6B-55525A40D718"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*", "matchCriteriaId": "366F1912-756B-443E-9962-224937DD7DFB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*", "matchCriteriaId": "7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*", "matchCriteriaId": "AF3E2B84-DAFE-4E11-B23B-026F719475F5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*", "matchCriteriaId": "213B5C7F-D965-4312-9CDF-4F06FA77D401"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6897:-:*:*:*:*:*:*:*", "matchCriteriaId": "2A7D8055-F4B6-41EE-A078-11D56285AB66"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6899:-:*:*:*:*:*:*:*", "matchCriteriaId": "C6E9F80F-9AC9-41E0-BB14-9DB6F14B62CD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6983:-:*:*:*:*:*:*:*", "matchCriteriaId": "EB6B9A26-F8A1-4322-AA4E-CDF8F7D99000"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6989:-:*:*:*:*:*:*:*", "matchCriteriaId": "AD7DE6B2-66D9-4A3E-B15F-D56505559255"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*", "matchCriteriaId": "CBBB30DF-E963-4940-B742-F6801F68C3FC"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8113:-:*:*:*:*:*:*:*", "matchCriteriaId": "F63268B4-5415-426A-A306-2006211FFE63"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8163:-:*:*:*:*:*:*:*", "matchCriteriaId": "1D2ED140-C41B-418B-9DC7-8C486304E769"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8168:-:*:*:*:*:*:*:*", "matchCriteriaId": "3CE2FC35-716A-4706-97BA-5DB165041580"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8169:-:*:*:*:*:*:*:*", "matchCriteriaId": "E5375050-4568-4919-BFE3-A72E1C7E65A2"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8183:-:*:*:*:*:*:*:*", "matchCriteriaId": "23F65D7B-31A1-4D94-82E9-254A7A6D7BE1"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8186:-:*:*:*:*:*:*:*", "matchCriteriaId": "E4932D34-06F4-49D7-81FB-772A82E8A5B5"}, {"vulnerable": false, "crite ... 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