| Name | CVE-2023-42670 |
| Description | A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners can be initiated, causing disruptions in the AD DC service. When Samba's RPC server experiences a high load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation "classic DCs") can erroneously start and compete for the same unix domain sockets. This issue leads to partial query responses from the AD DC, causing issues such as "The procedure number is out of range" when using tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5525-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| samba (PTS) | jessie, jessie (lts) | 2:4.2.14+dfsg-0+deb8u16 | vulnerable |
| stretch (security) | 2:4.5.16+dfsg-1+deb9u4 | vulnerable |
| stretch (lts), stretch | 2:4.5.16+dfsg-1+deb9u5 | vulnerable |
| buster (security), buster, buster (lts) | 2:4.9.5+dfsg-5+deb10u5 | fixed |
| bullseye (security), bullseye | 2:4.13.13+dfsg-1~deb11u6 | fixed |
| bookworm (security), bookworm | 2:4.17.12+dfsg-0+deb12u1 | fixed |
| trixie | 2:4.21.2+dfsg-3 | fixed |
| sid | 2:4.21.2+dfsg-4 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| samba | source | buster | (not affected) | | | |
| samba | source | bullseye | (not affected) | | | |
| samba | source | bookworm | 2:4.17.12+dfsg-0+deb12u1 | | DSA-5525-1 | |
| samba | source | (unstable) | 2:4.19.1+dfsg-1 | | | |
Notes
[bullseye] - samba <not-affected> (Vulnerable code not present)
[buster] - samba <not-affected> (Vulnerable code not present)
https://www.samba.org/samba/security/CVE-2023-42670.html
[stretch] - samba <ignored> (Domain controller functionality is EOLed)
[jessie] - samba <ignored> (Domain controller functionality is EOLed)