CVE-2018-16840

Publication date 31 October 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	18.10 cosmic	Fixed 7.61.0-1ubuntu2.2
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

introduced by https://github.com/curl/curl/commit/b46cfbc068 in curl 7.59

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3805-1
curl vulnerabilities
31 October 2018