MediumPublic exploit

Arbitrary File Read and Information Disclosure in Greasemonkey <0.3.5

IdentifiersCVE-2005-2455CWE-200

Greasemonkey versions prior to 0.3.5 contain multiple vulnerabilities that allow remote web servers to exploit the GM_xmlhttpRequest API to read arbitrary files from the user's system via crafted GET requests to file:// URLs. Additionally, attackers can enumerate installed user scripts using GM_scripts and access sensitive information stored via GM_setValue and GM_getValue.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

An attacker can remotely read arbitrary files from the victim's system, enumerate installed Greasemonkey scripts, and access sensitive data stored by scripts. This can lead to significant information disclosure, including theft of credentials, personal data, or other sensitive files accessible to the browser.

Mitigation

If you can’t patch tonight, do this now.

Until the extension is updated, users should disable Greasemonkey or avoid visiting untrusted websites. Restricting script permissions and reviewing installed scripts for unnecessary privileges can also reduce exposure.

Remediation

Patch, then assume compromise.

Upgrade Greasemonkey to version 0.3.5 or later, which addresses these vulnerabilities by restricting access to file:// URLs and improving the security of the affected APIs.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

GreasemonkeyGreasemonkeyapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

No public activity tracked yet. Mallory keeps watching.

0 SOURCESView more in app

No public activity observed for this vulnerability.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity