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CVE-2021-3738

Status Candidate

Overview

In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.

Related Files

Gentoo Linux Security Advisory 202309-06
Posted Sep 18, 2023
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202309-6 - Multiple vulnerabilities have been discovered in Samba, the worst of which could result in root remote code execution. Versions greater than or equal to 4.18.4 are affected.

tags | advisory, remote, root, vulnerability, code execution
systems | linux, gentoo
advisories | CVE-2007-4559, CVE-2016-2124, CVE-2020-17049, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-20251, CVE-2021-20316, CVE-2021-23192, CVE-2021-3670, CVE-2021-3738, CVE-2021-44141
SHA-256 | 6a49581d3fdfb4a2202121f6c5b6544b859edc2a8b279089f9dbccf4ce66b153
Ubuntu Security Notice USN-5142-3
Posted Dec 14, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5142-3 - USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes introduced a regression in Kerberos authentication in certain environments. Please see the following upstream bug for more information: https://bugzilla.samba.org/show_bug.cgi?id=14922 This update fixes the problem. Various other issues were also addressed.

tags | advisory, web, cgi, vulnerability
systems | linux, ubuntu
advisories | CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3671, CVE-2021-3738
SHA-256 | c2c8fcea9831797fd889f4570b8becd0d331cdb36d976a471a6dba4dad44aa41
Ubuntu Security Notice USN-5142-2
Posted Dec 7, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5142-2 - USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes introduced regressions in name mapping and backups.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3671, CVE-2021-3738
SHA-256 | 60ab885b043b1a4da1c403e7daee521f43b6fd29bf4dfb92a58090f1096a405d
Debian Security Advisory 5003-1
Posted Nov 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5003-1 - Several vulnerabilities have been discovered in Samba, a SMB/CIFS file, print, and login server for Unix.

tags | advisory, vulnerability
systems | linux, unix, debian
advisories | CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3738
SHA-256 | 0a7a09e04fa990a7673cc76314010ed6afc0c0ce0c674ddd1e882aa9f5c1973a
Ubuntu Security Notice USN-5142-1
Posted Nov 11, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5142-1 - Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos tickets issues by an RODC. An RODC could print administrator tickets, contrary to expectations. Various other issues were also addressed.

tags | advisory, remote, local, root
systems | linux, ubuntu
advisories | CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3671, CVE-2021-3738
SHA-256 | 61f1542773f3e13406c8cb0829dff2a3c2436272d81dd4de2c0b0a2767455f98
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