| Name | CVE-2023-27536 |
| Description | An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3398-1, ELA-831-1 |
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 | vulnerable |
| 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 | 7.38.0-4+deb8u26 | | ELA-831-1 | |
| curl | source | stretch | 7.52.1-5+deb9u19 | | ELA-831-1 | |
| curl | source | buster | 7.64.0-4+deb10u6 | | DLA-3398-1 | |
| curl | source | bullseye | 7.74.0-1.3+deb11u8 | | | |
| curl | source | (unstable) | 7.88.1-7 | | | |
Notes
https://curl.se/docs/CVE-2023-27536.html
Introduced by: https://github.com/curl/curl/commit/ebf42c4be76df40ec6d3bf32f229bbb274e2c32f (curl-7_22_0)
Fixed by: https://github.com/curl/curl/commit/cb49e67303dbafbab1cebf4086e3ec15b7d56ee5 (curl-8_0_0)