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Essential Packagist Vulnerability Opened Door for PHP Provide Chain Assault

By Ionut Arghire on October 04, 2022

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Code safety firm SonarSource right now revealed particulars on a extreme vulnerability impacting Packagist, which may have been abused to mount provide chain assaults concentrating on the PHP neighborhood.

Packagist is the default repository for PHP dependency supervisor Composer, aggregating public PHP packages that may be put in utilizing Composer. Every month, Composer is used to obtain greater than 2 billion packages.

In response to Sonar’s safety researchers, the just lately recognized vulnerability may have been used to hijack over 100 million requests to distribute malicious dependencies, resulting in the potential compromise of hundreds of thousands of servers.

“Since Composer is the usual package deal supervisor for PHP, most open-source and business PHP initiatives would have been impacted,” Sonar says.

Tracked as CVE-2022-24828, the vulnerability is described as a command injection difficulty that might permit an attacker to manage enter that’s interpreted as parameters for instructions executed by Composer.

“The Composer methodology VcsDriver::getFileContent() with user-controlled $file or $identifier arguments is inclined to an argument injection vulnerability. It may be leveraged to achieve arbitrary command execution if the Mercurial or the Git driver are used,” Composer’s maintainers clarify.

The flaw was just like CVE-2021-29472, a command injection bug recognized final 12 months, impacting the implementation of Model Management System driver (VcsDriver) sub-classes, which Composer invokes as exterior instructions.

Due to this vulnerability, a consumer controlling a Git or Mercurial repository may goal Packagist.org and Non-public Packagist by injecting parameters into the $file argument (impacting the Mercurial driver) or the $identifier argument (with influence on each Git and Mercurial drivers).

“Composer itself may be attacked by department names by anybody controlling a Git or Mercurial repository, which is explicitly listed by URL in a undertaking’s composer.json,” Composer’s maintainers word.

In response to Sonar, an attacker seeking to exploit the vulnerability would wish to create a undertaking in a distant Mercurial repository, add a manifest to composer.json and create a malicious ‘readme’ entry, create a .sh payload to carry out a desired motion, after which import the package deal to Packagist.

“The following step can be to switch the definition of a package deal to level to an unintended vacation spot and compromise the applying through which they’re used,” Sonar explains.

The vulnerability was reported to the Packagist maintainers on April 7 and a hotpatch was launched the subsequent day. The problem was addressed with the discharge of Composer variations 2.3.5, 2.2.12, and 1.10.26, and no proof of in-the-wild exploitation was discovered.

Associated: Essential Vulnerability Patched in PHP Package deal Repository

Associated: New ‘Wolfi’ Linux Distro Focuses on Software program Provide Chain Safety

Associated: GitHub Says Vulnerabilities in Some Ecosystems Take Years to Repair

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