High

OpenSSL ChaCha20-Poly1305 Heap Buffer Overflow

IdentifiersCVE-2016-7054CWE-122

CVE-2016-7054 is a heap-based buffer overflow in OpenSSL ChaCha20/Poly1305 processing affecting OpenSSL 1.1.0 releases before 1.1.0c. TLS connections that negotiate a *-CHACHA20-POLY1305 cipher suite can be terminated by processing a sufficiently large corrupted payload, causing the OpenSSL process to crash.

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.

A remote attacker can cause denial of service by crashing an affected OpenSSL application or service. OpenSSL assessed the issue as not exploitable beyond denial of service.

Mitigation

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

Until an upgrade can be deployed, disable *-CHACHA20-POLY1305 cipher suites in affected TLS configurations where operationally feasible, and restrict exposure of affected TLS services to trusted clients or networks.

Remediation

Patch, then assume compromise.

Upgrade OpenSSL 1.1.0 installations to OpenSSL 1.1.0c or a later supported release containing the fix.

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

OpenSSL Software FoundationOpensslapplication

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

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

opensslNews

Nov 10, 2016

[no-title]

A high-severity heap-buffer-overflow in OpenSSL ChaCha20-Poly1305 TLS cipher suite handling that can crash OpenSSL and cause denial of service when processing larger corrupted payloads.

digicert blogNews

Sep 11, 2016

OpenSSL Patches 3 Security Vulnerabilities in OpenSSL 1.1.0 | DigiCert.com

A high severity heap-buffer-overflow vulnerability in OpenSSL's ChaCha20/Poly1305 handling that can allow a denial-of-service crash via a large corrupted payload on affected TLS connections.

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