Bug 1642203 (CVE-2018-16840) - CVE-2018-16840 curl: Use-after-free when closing "easy" handle in Curl_close()
Summary: CVE-2018-16840 curl: Use-after-free when closing "easy" handle in Curl_close()
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-16840
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1644555 1644556 1644557 1652660
Blocks: 1642204
TreeView+ depends on / blocked
 
Reported: 2018-10-24 01:51 UTC by Sam Fowler
Modified: 2021-12-10 18:02 UTC (History)
30 users (show)

Fixed In Version: curl 7.62.0
Clone Of:
Environment:
Last Closed: 2021-10-25 09:51:37 UTC
Embargoed:

Attachments (Terms of Use)

Description Sam Fowler 2018-10-24 01:51:43 UTC 
Curl versions 7.59.0 to 7.61.1 are vulnerable to heap use-after-free flaw in 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.
Comment 1 Sam Fowler 2018-10-24 01:52:01 UTC 
Acknowledgments:

Name: the Curl project
Upstream: Brian Carpenter (Geeknik Labs)
Comment 2 Sam Fowler 2018-10-31 07:02:05 UTC 
External Reference:

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


Upstream Patch:

https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f
Comment 3 Sam Fowler 2018-10-31 07:02:42 UTC 
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1644555]


Created mingw-curl tracking bugs for this issue:

Affects: epel-7 [bug 1644556]
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