CVE-2018-16840
Last modified
CVE-2018-16840 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.33% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.59.0, < 7.62.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 18.10 |
References
- http://www.securitytracker.com/id/1042013Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Issue Tracking, Third Party Advisory
- https://curl.haxx.se/docs/CVE-2018-16840.htmlPatch, Vendor Advisory
- https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fPatch, Third Party Advisory
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://usn.ubuntu.com/3805-1/Third Party Advisory
- http://www.securitytracker.com/id/1042013Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Issue Tracking, Third Party Advisory
- https://curl.haxx.se/docs/CVE-2018-16840.htmlPatch, Vendor Advisory
- https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fPatch, Third Party Advisory
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://usn.ubuntu.com/3805-1/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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