CVE-2018-16840: Use After Free
First published: Wed Oct 31 2018(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Haxx Curl | >=7.59.0<=7.61.1 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =18.10 | |
| ubuntu/curl | <7.61.0-1ubuntu2.2 | 7.61.0-1ubuntu2.2 |
| debian/curl | 7.74.0-1.3+deb11u12 7.74.0-1.3+deb11u11 7.88.1-10+deb12u6 7.88.1-10+deb12u5 8.8.0-4 8.9.1-2 |
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Reference Links
- 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://security.gentoo.org/glsa/201903-03
- https://usn.ubuntu.com/3805-1/
- https://launchpad.net/bugs/cve/CVE-2018-16840
- https://github.com/curl/curl/commit/b46cfbc068ebe90f18e9777b9e877e4934c1b5e3
- https://security-tracker.debian.org/tracker/CVE-2018-16840
- https://ubuntu.com/security/notices/USN-3805-1
- https://www.cve.org/CVERecord?id=CVE-2018-16840
- https://nvd.nist.gov/vuln/detail/CVE-2018-16840
- https://ubuntu.com/security/CVE-2018-16840
Frequently Asked Questions
What is the vulnerability ID of this flaw?
The vulnerability ID of this flaw is CVE-2018-16840.
What is the severity of CVE-2018-16840?
The severity of CVE-2018-16840 is critical with a severity value of 9.8.
Which software versions are affected by CVE-2018-16840?
Curl versions from 7.59.0 through 7.61.1 are affected by CVE-2018-16840.
How can I fix CVE-2018-16840?
Upgrade to one of the recommended versions: 7.64.0-4+deb10u2, 7.64.0-4+deb10u7, 7.74.0-1.3+deb11u9, 7.74.0-1.3+deb11u10, 7.88.1-10+deb12u3, 7.88.1-10+deb12u4, or 8.4.0-2.
Are there any additional references for CVE-2018-16840?
Yes, you can find additional references for CVE-2018-16840 at the following links: [Reference 1](https://curl.haxx.se/docs/CVE-2018-16840.html), [Reference 2](https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840), [Reference 3](https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f).
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