如何使用Packj检测恶意或高风险的开源软件包

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发布于 2022-11-14 15:43:35

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发布于 2022-11-14 15:43:35

文章被收录于专栏：FreeBuf

关于Packj

Packj是一款功能强大的代码安全检测工具，该工具本质上是一个命令行接口工具套件，可以帮助广大研究人员检测软件代码包中潜在的恶意或高风险代码，旨在缓解软件供应链攻击。该工具支持识别当前热门开源软件管理工具中提供的软件代码包，比如说NPM、RubyGems和PyPI等。在该工具的帮助下，我们可以持续审查软件包并获取免费的风险评估报告。

工具下载

由于该工具基于Python 3开发，因此我们首先需要在本地设备上安装并配置好Python 3环境。接下来，使用下列命令将该项目源码克隆至本地：

git clone https://github.com/anil-yelken/Vulnerable-Soap-Service.git

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Packj提供了下列工具：

Audit：用于检测软件代码包中的高位风险属性； Sandbox：用于安全安装软件包的环境；

$ python3 main.py --help

usage: main [options] args

options:

    audit          Audit a package for malware/risky attributes

    sandbox        Sandbox package installation to mitigate risks
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工具使用

审计一个代码包

Packj可以审计开源软件包的“高风险”属性，即可能会让其容易受到供应链攻击的各种因素。比如说，包含过期电子邮件的包（缺少2FA）、发布时间间隔太长、敏感API或访问权限问题等。

工具支持审计下列内容：多个软件包：

python3 main.py -p pypi:requests rubygems:overcommit

依赖文件：

python3 main.py -f npm:package.json pypi:requirements.txt

我们还可以在一个Docker/Podman容器中执行审计操作：

$ docker run -v /tmp:/tmp/packj -it ossillate/packj:latest audit --trace -p npm:browserify
[+] Fetching 'browserify' from npm...OK [ver 17.0.0]

[+] Checking version...ALERT [598 days old]

[+] Checking release history...OK [484 version(s)]

[+] Checking release time gap...OK [68 days since last release]

[+] Checking author...OK [mail@substack.net]

[+] Checking email/domain validity...ALERT [expired author email domain]

[+] Checking readme...OK [26838 bytes]

[+] Checking homepage...OK [https://github.com/browserify/browserify#readme]

[+] Checking downloads...OK [2.2M weekly]

[+] Checking repo_url URL...OK [https://github.com/browserify/browserify]

[+] Checking repo data...OK [stars: 14077, forks: 1236]

[+] Checking repo activity...OK [commits: 2290, contributors: 207, tags: 413]

[+] Checking for CVEs...OK [none found]

[+] Checking dependencies...ALERT [48 found]

[+] Downloading package 'browserify' (ver 17.0.0) from npm...OK [163.83 KB]

[+] Analyzing code...ALERT [needs 3 perms: process,file,codegen]

[+] Checking files/funcs...OK [429 files (383 .js), 744 funcs, LoC: 9.7K]

[+] Installing package and tracing code...OK [found ['process', 'files', 'network'] syscalls]

=============================================

[+] 5 risk(s) found, package is undesirable!

=> Complete report: /tmp/packj_54rbjhgm/report_npm-browserify-17.0.0_hlr1rhcz.json

{

    "undesirable": [

        "old package: 598 days old",

        "invalid or no author email: expired author email domain",

        "generates new code at runtime",

        "reads files and dirs",

        "forks or exits OS processes",

    ]

}

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软件包沙箱安装

Packj提供了一个轻量级沙箱环境，可以用于安全地安装和测试软件包。具体而言，它可以防止恶意软件包提取敏感数据、访问敏感文件（如SSH密钥）以及植入持久化恶意软件等。操作命令如下：

$ python3 main.py sandbox gem install overcommit

Fetching: overcommit-0.59.1.gem (100%)

Install hooks by running `overcommit --install` in your Git repository

Successfully installed overcommit-0.59.1

Parsing documentation for overcommit-0.59.1

Installing ri documentation for overcommit-0.59.1

#############################

# Review summarized activity

#############################

[+] Network connections

[+] DNS (1 IPv4 addresses) at port 53 [rule: ALLOW]

[+] rubygems.org (4 IPv6 addresses) at port 443 [rule: IPv6 rules not supported]

[+] rubygems.org (4 IPv4 addresses) at port 443 [rule: ALLOW]

[+] Filesystem changes

/

└── home

    └── ubuntu

        └── .ruby

            ├── gems

            │   ├── iniparse-1.5.0 [new: DIR, 15 files, 46.6K bytes]

            │   ├── rexml-3.2.5 [new: DIR, 77 files, 455.6K bytes]

            │   ├── overcommit-0.59.1 [new: DIR, 252 files, 432.7K bytes]

            │   └── childprocess-4.1.0 [new: DIR, 57 files, 141.2K bytes]

            ├── cache

            │   ├── iniparse-1.5.0.gem [new: FILE, 16.4K bytes]

            │   ├── rexml-3.2.5.gem [new: FILE, 93.2K bytes]

            │   ├── childprocess-4.1.0.gem [new: FILE, 34.3K bytes]

            │   └── overcommit-0.59.1.gem [new: FILE, 84K bytes]

            ├── specifications

            │   ├── rexml-3.2.5.gemspec [new: FILE, 2.7K bytes]

            │   ├── overcommit-0.59.1.gemspec [new: FILE, 1.7K bytes]

            │   ├── childprocess-4.1.0.gemspec [new: FILE, 1.8K bytes]

            │   └── iniparse-1.5.0.gemspec [new: FILE, 1.3K bytes]

            ├── bin

            │   └── overcommit [new: FILE, 622 bytes]

            └── doc

                ├── iniparse-1.5.0

                │   └── ri [new: DIR, 119 files, 131.7K bytes]

                ├── rexml-3.2.5

                │   └── ri [new: DIR, 836 files, 841K bytes]

                ├── overcommit-0.59.1

                │   └── ri [new: DIR, 1046 files, 1.5M bytes]

                └── childprocess-4.1.0

                    └── ri [new: DIR, 272 files, 297.8K bytes]

 

[C]ommit all changes, [Q|q]uit & discard changes, [L|l]ist details:

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恶意软件检测

在测试该工具的时候，我们成功地在PyPI上搜索出了40个恶意软家包，其中有部分已经被下架了：

$ python3 main.py audit pypi:krisqian

[+] Fetching 'krisqian' from pypi...OK [ver 0.0.7]

[+] Checking version...OK [256 days old]

[+] Checking release history...OK [7 version(s)]

[+] Checking release time gap...OK [1 days since last release]

[+] Checking author...OK [KrisWuQian@baidu.com]

[+] Checking email/domain validity...OK [KrisWuQian@baidu.com]

[+] Checking readme...ALERT [no readme]

[+] Checking homepage...OK [https://www.bilibili.com/bangumi/media/md140632]

[+] Checking downloads...OK [13 weekly]

[+] Checking repo_url URL...OK [None]

[+] Checking for CVEs...OK [none found]

[+] Checking dependencies...OK [none found]

[+] Downloading package 'KrisQian' (ver 0.0.7) from pypi...OK [1.94 KB]

[+] Analyzing code...ALERT [needs 3 perms: process,network,file]

[+] Checking files/funcs...OK [9 files (2 .py), 6 funcs, LoC: 184]

=============================================

[+] 6 risk(s) found, package is undesirable!

{

    "undesirable": [

        "no readme",

        "only 45 weekly downloads",

        "no source repo found",

        "generates new code at runtime",

        "fetches data over the network: ['KrisQian-0.0.7/setup.py:40', 'KrisQian-0.0.7/setup.py:50']",

        "reads files and dirs: ['KrisQian-0.0.7/setup.py:59', 'KrisQian-0.0.7/setup.py:70']"

    ]

}

=> Complete report: pypi-KrisQian-0.0.7.json

=> View pre-vetted package report at https://packj.dev/package/PyPi/KrisQian/0.0.7
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其中，Packj将KrisQian（v0.0.7）标记为可疑，因为在包安装期间（在setup.py中）缺少源代码库和使用敏感API（用于网络通信、代码生成）。经过进一步研究和分析，我们验证了这个代码包确实是存在安全问题的。

许可证协议

本项目的开发与发布遵循AGPL-3.0开源许可证协议。

项目地址

Packj：https://github.com/ossillate-inc/packj

参考资料：

https://packj.dev/ https://www.you*tube.com/watch?v=Rcuqn56uCDk https://speakerdeck.com/ashishbijlani/pyconus22-slides https://www.blackhat.com/asia-22/arsenal/schedule/#mitigating-open-source-software-supply-chain-attacks-26241 https://www.blackhat.com/us-22/arsenal/schedule/#detecting-typo-squatting-backdoored-abandoned-and-other-risky-open-source-packages-using-packj-28075 https://osseu2022.sched.com/overview/type/SupplyChainSecurityCon https://nullcon.net/goa-2022/unearthing-malicious-and-other-risky-open-source-packages-using-packj https://www.you*tube.com/watch?v=PHfN-NrUCoo https://speakerdeck.com/ashishbijlani/mitigating-open-source-software-supply-chain-attacks

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原始发表：2022-09-20，如有侵权请联系 cloudcommunity@tencent.com 删除

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