CVE-2018-16840

HIGH

Description

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.

References

http://www.securitytracker.com/id/1042013

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840

https://curl.haxx.se/docs/CVE-2018-16840.html

https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f

https://usn.ubuntu.com/3805-1/

Details

Source: MITRE

Published: 2018-10-31

Modified: 2018-12-07

Type: CWE-416

Risk Information

CVSS v2.0

Base Score: 7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 10

Severity: HIGH

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 3.9

Severity: CRITICAL