How CVE-2025-1932 Works
CVE-2025-1932 is an out-of-bounds access vulnerability in Mozilla Firefox, Firefox ESR, and Thunderbird due to an inconsistent comparator in xslt/txNodeSorter. The flaw occurs when sorting XSLT nodes, where improper bounds checking allows memory corruption. Attackers could exploit this by crafting malicious XSLT content, leading to arbitrary code execution or crashes. The vulnerability affects Firefox versions 122+ before 136, Firefox ESR before 128.8, and Thunderbird before 136/128.8.
DailyCVE Form:
Platform: Firefox/Firefox ESR/Thunderbird
Version: 122–136 / <128.8
Vulnerability: Out-of-bounds access
Severity: Critical
Date: 03/28/2025
What Undercode Say:
Exploitation:
1. Craft malicious XSLT payload triggering node sorting.
2. Force inconsistent comparator execution.
3. Trigger out-of-bounds memory access.
Protection:
- Update to Firefox ≥136, Firefox ESR ≥128.8, Thunderbird ≥136/128.8.
- Disable XSLT processing if unused (
about:config→disable_xslt).
Detection Commands:
Check Firefox version (Linux/macOS): firefox --version | grep -E "122|12[bash]|13[bash]" Windows (PowerShell): Get-ItemProperty "HKLM:\Software\Mozilla\Mozilla Firefox" | Select-Object Version
Debugging (Crash Analysis):
gdb --args firefox -no-remote -profile /tmp/malicious.xsl
Mitigation Code (Temporary):
// Add-ons can intercept XSLT (example):
window.addEventListener("load", () => {
if (document.XSLTProcessor) {
document.XSLTProcessor = null;
}
}, { once: true });
References:
Analytics:
- CVSS 4.0: 9.8 (AV:N/AC:L/AT:N/PR:N/UI:N/S:C/C:H/I:H/A:H)
- Exploitability: High (PoC likely).
- Patch urgency: Immediate.
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-1932
Extra Source Hub:
Undercode
