| Name | CVE-2021-4209 |
| Description | A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more) |
| References | DLA-3070-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| gnutls28 (PTS) | buster | 3.6.7-4+deb10u8 | vulnerable |
| buster (security) | 3.6.7-4+deb10u10 | fixed | |
| bullseye | 3.7.1-5+deb11u2 | fixed | |
| bullseye (security) | 3.7.1-5+deb11u3 | fixed | |
| bookworm, sid | 3.7.9-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| gnutls28 | source | buster | 3.6.7-4+deb10u9 | DLA-3070-1 | ||
| gnutls28 | source | bullseye | 3.7.1-5+deb11u1 | |||
| gnutls28 | source | (unstable) | 3.7.3-2 |
[stretch] - gnutls28 <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2044156
https://gitlab.com/gnutls/gnutls/-/issues/1306
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
Fixed by: https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568 (3.7.3)