CVE-2018-16840

NameCVE-2018-16840
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)jessie7.38.0-4+deb8u11fixed
jessie (security)7.38.0-4+deb8u16fixed
stretch (security), stretch7.52.1-5+deb9u9fixed
buster7.64.0-4fixed
bullseye, sid7.67.0-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsource(unstable)7.62.0-1
curlsourcejessie(not affected)
curlsourcestretch(not affected)

Notes

[stretch] - curl <not-affected> (Use-after-free issue introduced later)
[jessie] - curl <not-affected> (Use-after-free issue introduced later)
https://curl.haxx.se/docs/CVE-2018-16840.html
Fixed by: https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f
Introduced by: https://github.com/curl/curl/commit/b46cfbc068ebe90f18e9777b9e877e4934c1b5e3

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