| Name | CVE-2018-16840 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| curl (PTS) | jessie, jessie (lts) | 7.38.0-4+deb8u28 | fixed |
| stretch (security) | 7.52.1-5+deb9u16 | fixed |
| stretch (lts), stretch | 7.52.1-5+deb9u22 | fixed |
| buster, buster (lts) | 7.64.0-4+deb10u10 | fixed |
| buster (security) | 7.64.0-4+deb10u9 | fixed |
| bullseye | 7.74.0-1.3+deb11u13 | fixed |
| bullseye (security) | 7.74.0-1.3+deb11u14 | fixed |
| bookworm | 7.88.1-10+deb12u8 | fixed |
| bookworm (security) | 7.88.1-10+deb12u5 | fixed |
| sid, trixie | 8.11.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | wheezy | (not affected) | | | |
| curl | source | jessie | (not affected) | | | |
| curl | source | stretch | (not affected) | | | |
| curl | source | (unstable) | 7.62.0-1 | | | |
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
[wheezy] - curl <not-affected> (Use-after-free issue introduced later)