Vulnerability Monitor

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CVE-2018-16840

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.

Published

2018-10-31T18:29:00.307

Last Modified

2025-04-17T13:05:04.557

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Secondary
CWE-416
Type: Primary
CWE-416

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	haxx	curl	< 7.62.0	Yes
Operating System	canonical	ubuntu_linux	14.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	canonical	ubuntu_linux	18.10	Yes

References

http://www.securitytracker.com/id/1042013 Third Party Advisory, VDB Entry ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840 Issue Tracking, Third Party Advisory ([email protected])
https://curl.haxx.se/docs/CVE-2018-16840.html Patch, Vendor Advisory ([email protected])
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f Patch, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/201903-03 Third Party Advisory ([email protected])
https://usn.ubuntu.com/3805-1/ Third Party Advisory ([email protected])
http://www.securitytracker.com/id/1042013 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://curl.haxx.se/docs/CVE-2018-16840.html Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201903-03 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3805-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)