CVE-2018-6307 — LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-

LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

01What is this vulnerability?

LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

02Affected products

Vendor	Product	Versions
n	a / LibVNC	commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-12-19T16:00:00.000Z
• Last modified: 2024-08-05T06:01:48.679Z

09References

• ics-cert.kaspersky.com — https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18…
• www.debian.org — https://www.debian.org/security/2019/dsa-4383
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
• usn.ubuntu.com — https://usn.ubuntu.com/3877-1/
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html