CVE-2018-16840
CRITICAL severity · CVSS 9.8 · Use-after-free
9.8CVSS CRITICAL
Summary
A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)3%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://curl.haxx.se/docs/CVE-2018-16840.html ↗
Additional information
- NVD record
- https://curl.haxx.se/docs/CVE-2018-16840.htmlPatch
- https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fPatch
- http://www.securitytracker.com/id/1042013Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Advisory
- https://security.gentoo.org/glsa/201903-03Advisory
- https://usn.ubuntu.com/3805-1/Advisory