CVE-2020-15999: Heap buffer overflow in CefSharp

CVE-2020-15999 · Severity: critical · CVSS 3.1 · Exploited in the wild · Published 2020-10-27

A heap buffer overflow vulnerability exists in the FreeType font rendering library, specifically within the Load_SBit_Png function when processing PNG images embedded in fonts. A remote attacker can exploit this via a crafted HTML page to cause heap corruption, potentially leading to arbitrary code execution.

Technologies: CefSharp.Common (NuGet), CefSharp.WinForms (NuGet), CefSharp.Wpf (NuGet), CefSharp.Wpf.HwndHost (NuGet). Vendors: Google, NuGet.

Quick answers

Is CVE-2020-15999 exploited in the wild?
Yes. CVE-2020-15999 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2020-15999?
Critical severity, with a CVSS score of 3.1, published 27 October 2020.
Which products and versions are affected?
CefSharp.Common (NuGet) ECOSYSTEM:introduced=0,fixed=85.3.130; CefSharp.WinForms (NuGet) ECOSYSTEM:introduced=0,fixed=85.3.130; CefSharp.Wpf (NuGet) ECOSYSTEM:introduced=0,fixed=85.3.130; CefSharp.Wpf.HwndHost (NuGet) ECOSYSTEM:introduced=0,fixed=85.3.130.
Is there a fix for CVE-2020-15999?
Yes. CefSharp.Common (NuGet): upgrade to 85.3.130 or later; CefSharp.WinForms (NuGet): upgrade to 85.3.130 or later; CefSharp.Wpf (NuGet): upgrade to 85.3.130 or later; CefSharp.Wpf.HwndHost (NuGet): upgrade to 85.3.130 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2020-15999 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2020-15999?
Check whether you run Google Chrome Freetype, CefSharp.Common (NuGet), CefSharp.WinForms (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • CefSharp.Common (NuGet): upgrade to 85.3.130 or later
    dotnet add package CefSharp.Common --version 85.3.130
  • CefSharp.WinForms (NuGet): upgrade to 85.3.130 or later
    dotnet add package CefSharp.WinForms --version 85.3.130
  • CefSharp.Wpf (NuGet): upgrade to 85.3.130 or later
    dotnet add package CefSharp.Wpf --version 85.3.130
  • CefSharp.Wpf.HwndHost (NuGet): upgrade to 85.3.130 or later
    dotnet add package CefSharp.Wpf.HwndHost --version 85.3.130

Affected products

  • Google Chrome prior to 86.0.4240.111
  • FreeType FreeType

Identifiers

  • CVE-2020-15999
  • GHSA-pv36-h7jh-qm62

Timeline

  • 2020-10-20: patched: Stable channel update for desktop 86.0.4240.111 released.
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
  • 2021-11-03: disclosed: NVD publication date.

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