| Name | CVE-2020-27840 |
| Description | A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability. |
| 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-2611-1, DSA-4884-1, ELA-393-1 |
| Debian Bugs | 985936 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| ldb (PTS) | jessie, jessie (lts) | 2:1.1.20-0+deb8u3 | fixed |
| stretch (security), stretch (lts), stretch | 2:1.1.27-1+deb9u2 | fixed | |
| buster (security), buster, buster (lts) | 2:1.5.1+really1.4.6-3+deb10u1 | fixed | |
| bullseye (security), bullseye | 2:2.2.3-2~deb11u2 | fixed | |
| 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 | vulnerable | |
| bullseye (security), bullseye | 2:4.13.13+dfsg-1~deb11u6 | vulnerable | |
| bookworm (security), bookworm | 2:4.17.12+dfsg-0+deb12u1 | fixed | |
| sid, trixie | 2:4.21.1+dfsg-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| ldb | source | jessie | 2:1.1.20-0+deb8u3 | ELA-393-1 | ||
| ldb | source | stretch | 2:1.1.27-1+deb9u2 | DLA-2611-1 | ||
| ldb | source | buster | 2:1.5.1+really1.4.6-3+deb10u1 | DSA-4884-1 | ||
| ldb | source | (unstable) | 2:2.2.0-3.1 | 985936 | ||
| samba | source | (unstable) | 2:4.13.13+dfsg-1 | unimportant |
https://www.samba.org/samba/security/CVE-2020-27840.html
https://bugzilla.samba.org/show_bug.cgi?id=14595
https://git.samba.org/?p=samba.git;a=commitdiff;h=1996b79f376b459bb964a6344ca5f264e7d6e2ec
https://git.samba.org/?p=samba.git;a=commitdiff;h=dbb3e65f7e382adf5fa6a6afb3d8684aca3f201a
https://git.samba.org/?p=samba.git;a=commitdiff;h=9532c44baea130db74f866e1472cb871936cd3dd
Samba uses the System ldb library