CVE-2013-1675: Mozilla Firefox Information Disclosure Vulnerability

CVE-2013-1675 is an information-disclosure vulnerability in Mozilla Firefox. Improper initialization of certain data structures lets a remote attacker use a crafted web site to read sensitive information from the browser’s process memory. For IT and security teams this matters because browsers run on nearly every endpoint and routinely process untrusted content; successful abuse can leak memory contents that may include credentials, tokens, or other sensitive data present in the process.

Public detail is limited to the CISA description and the associated CWE. Confirm exact affected builds, fixed versions, and any additional technical notes directly against the vendor advisory before acting.

How it works

The weakness is classified as CWE-119 (improper restriction of operations within the bounds of a memory buffer). In this case Mozilla Firefox does not properly initialize data structures used by the nsDOMSVGZoomEvent::mPreviousScale and nsDOMSVGZoomEvent::mNewScale functions. Because those structures are left in an uninitialized state, a crafted web page that triggers the relevant SVG zoom event handling can cause the browser to return residual data from process memory to the attacker.

An attacker simply needs the victim to load the malicious page in a vulnerable Firefox instance. No further user interaction beyond normal browsing is required once the page is rendered. The result is disclosure of whatever memory contents happen to reside in the uninitialized structures at that moment. Specifics of exploit construction or reliable memory layouts are not provided in the available facts and must not be assumed; treat any public proof-of-concept material with caution and validate against the vendor advisory.

Am I affected? How to find it in your systems

Mozilla Firefox is commonly installed on workstations, laptops, and some shared or kiosk systems. Inventory every endpoint and virtual desktop that may run the browser:

• Query software inventory or endpoint-management tools for the Firefox package and its reported version string.
• On managed Windows hosts, check Add/Remove Programs, WMI, or the Firefox installation directory; on macOS and Linux use the respective package managers or the application’s about:support page.
• Identify any lingering portable, ESR, or side-by-side installations that may not be covered by standard patching pipelines.

Because exact vulnerable version ranges are not listed in the supplied facts, compare every discovered version against the vendor advisory. Look for signs of exploitation in browser and proxy logs: unexpected crashes or hangs correlated with SVG-heavy or zoom-related content, anomalous outbound connections immediately after page loads, or memory-related error reports. Such telemetry is only suggestive; absence of obvious indicators does not prove the environment is clean.

How to remediate

The required action is to apply updates per vendor instructions. Obtain the fixed Firefox release from Mozilla’s official channels and deploy it through your normal software-distribution process. After installation, verify the running version on a sample of endpoints matches the remediated build listed in the advisory.

Once the patch is in place, reinforce baseline browser hygiene for this class of memory-safety issue:

• Keep automatic updates enabled where operationally feasible.
• Restrict the ability of standard users to install or run unapproved browser binaries.
• Ensure crash-reporting and telemetry (if permitted by policy) are collected so future memory-corruption events can be triaged quickly.

If you can't patch immediately

When immediate patching is blocked by change windows or compatibility constraints, apply compensating controls to reduce exposure:

• Segment high-risk browsing (for example, general internet access) onto isolated VDI or dedicated jump hosts that can be patched or rebuilt more aggressively.
• Use a web gateway or browser isolation service to render untrusted pages away from the corporate endpoint.
• If a virtual-patching or WAF rule set is available for the vulnerability class, enable it while confirming it does not break legitimate SVG content.
• Temporarily disable or limit unnecessary browser features that exercise SVG zoom handling if your environment allows such configuration; test thoroughly first.
• Increase monitoring for Firefox process crashes, unusual memory-access patterns, and connections to newly registered or suspicious domains.

These measures only buy time; they do not eliminate the underlying uninitialized-memory condition. Schedule the vendor update as soon as practicable.

If your data may have been exposed

Actively exploited browser vulnerabilities can lead to credential or token theft and subsequent breaches. Known ransomware use of this CVE is not documented, yet any successful memory disclosure still warrants investigation of potentially affected accounts. Review access logs for anomalous logins and rotate credentials that may have resided in browser memory. As a quick additional check, users can run a free exposure scan of their work email addresses against known breach data sets to determine whether those addresses already appear in public compilations.