CVE-2018-17847 — FEDORA
HIGHCVE-2018-17847 is a high-severity (CVSS 7.5) Buffer Overflow vulnerability in fedoraproject fedora. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. Versions up to 2018-09-25 are affected; the records list no fixed version yet, so check the vendor advisory below.
The html package (aka x/net/html) through 2018-09-25 in Go mishandles <svg><template><desc><t><svg></template>, leading to a "panic: runtime error" (index out of range) in (*nodeStack).pop…
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
The html package (aka x/net/html) through 2018-09-25 in Go mishandles <svg><template><desc><t><svg></template>, leading to a "panic: runtime error" (index out of range) in (*nodeStack).pop in node.go, called from (*parser).clearActiveFormattingElements, during an html.Parse call.
Affected Products
fedorafedoraprojectnetgolangResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every fedoraproject fedora deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2018-17847 (versions up to 2018-09-25 are affected). Check the fedoraproject fedora advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2018-17847 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.