| Name | CVE-2023-27537 |
| Description | A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free. |
| 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 | 8.11.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | jessie | (not affected) | | | |
| curl | source | stretch | (not affected) | | | |
| curl | source | buster | (not affected) | | | |
| curl | source | bullseye | (not affected) | | | |
| curl | source | (unstable) | 7.88.1-7 | | | |
Notes
[bullseye] - curl <not-affected> (Vulnerable code introduced later)
[buster] - curl <not-affected> (Vulnerable code introduced later)
https://curl.se/docs/CVE-2023-27537.html
Introduced by: https://github.com/curl/curl/commit/076a2f629119222aeeb50f5a03bf9f9052fabb9a (curl-7_88_0)
Fixed by: https://github.com/curl/curl/commit/dca4cdf071be095bcdc7126eaa77a8946ea4790b (curl-8_0_0)
[stretch] - curl <not-affected> (Vulnerable code introduced later)
[jessie] - curl <not-affected> (Vulnerable code introduced later)