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CVE-2021-3738

CVE-2021-3738

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.8 · High · EPSS 2.0% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • samba

    Versions
    • Affects all versions since samba 4.0 | Fixedin samba v4.15.2, v4.14.10 and v4.13.14: Affected

    No fix published

  • samba Debian:12

    Affected ranges
    • ECOSYSTEM: < 2:4.13.14+dfsg-1

    Update to 2:4.13.14+dfsg-1

  • samba Debian:13

    Affected ranges
    • ECOSYSTEM: < 2:4.13.14+dfsg-1

    Update to 2:4.13.14+dfsg-1

  • samba Debian:14

    Affected ranges
    • ECOSYSTEM: < 2:4.13.14+dfsg-1

    Update to 2:4.13.14+dfsg-1

  • samba Ubuntu:Pro:14.04:LTS

    Versions
    • 2:3.6.18-1ubuntu3
    • 2:4.0.10+dfsg-4ubuntu2
    • 2:4.0.13+dfsg-1ubuntu1
    • 2:4.1.3+dfsg-2ubuntu2
    • 2:4.1.3+dfsg-2ubuntu3
    • 2:4.1.3+dfsg-2ubuntu4
    • 2:4.1.3+dfsg-2ubuntu5
    • 2:4.1.6+dfsg-1ubuntu1
    • 2:4.1.6+dfsg-1ubuntu2
    • 2:4.1.6+dfsg-1ubuntu2.14.04.1
    • 2:4.1.6+dfsg-1ubuntu2.14.04.2
    • 2:4.1.6+dfsg-1ubuntu2.14.04.3
    • 2:4.1.6+dfsg-1ubuntu2.14.04.4
    • 2:4.1.6+dfsg-1ubuntu2.14.04.5
    • 2:4.1.6+dfsg-1ubuntu2.14.04.7
    • 2:4.1.6+dfsg-1ubuntu2.14.04.8
    • 2:4.1.6+dfsg-1ubuntu2.14.04.9
    • 2:4.1.6+dfsg-1ubuntu2.14.04.11
    • 2:4.1.6+dfsg-1ubuntu2.14.04.12
    • 2:4.1.6+dfsg-1ubuntu2.14.04.13
    • 2:4.3.8+dfsg-0ubuntu0.14.04.2
    • 2:4.3.9+dfsg-0ubuntu0.14.04.1
    • 2:4.3.9+dfsg-0ubuntu0.14.04.3
    • 2:4.3.11+dfsg-0ubuntu0.14.04.1
    • 2:4.3.11+dfsg-0ubuntu0.14.04.2
    • 2:4.3.11+dfsg-0ubuntu0.14.04.3
    • 2:4.3.11+dfsg-0ubuntu0.14.04.4
    • 2:4.3.11+dfsg-0ubuntu0.14.04.6
    • 2:4.3.11+dfsg-0ubuntu0.14.04.7
    • 2:4.3.11+dfsg-0ubuntu0.14.04.8
    • 2:4.3.11+dfsg-0ubuntu0.14.04.9
    • 2:4.3.11+dfsg-0ubuntu0.14.04.10
    • 2:4.3.11+dfsg-0ubuntu0.14.04.11
    • 2:4.3.11+dfsg-0ubuntu0.14.04.12
    • 2:4.3.11+dfsg-0ubuntu0.14.04.13
    • 2:4.3.11+dfsg-0ubuntu0.14.04.14
    • 2:4.3.11+dfsg-0ubuntu0.14.04.16
    • 2:4.3.11+dfsg-0ubuntu0.14.04.17
    • 2:4.3.11+dfsg-0ubuntu0.14.04.19
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm3
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm6
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm9
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm12
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm14
    • 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • samba Ubuntu:Pro:16.04:LTS

    Versions
    • 2:4.1.17+dfsg-4ubuntu2
    • 2:4.1.20+dfsg-1ubuntu1
    • 2:4.1.20+dfsg-1ubuntu2
    • 2:4.1.20+dfsg-1ubuntu3
    • 2:4.1.20+dfsg-1ubuntu5
    • 2:4.3.3+dfsg-1ubuntu1
    • 2:4.3.3+dfsg-1ubuntu2
    • 2:4.3.3+dfsg-1ubuntu3
    • 2:4.3.6+dfsg-1ubuntu1
    • 2:4.3.8+dfsg-0ubuntu1
    • 2:4.3.9+dfsg-0ubuntu0.16.04.1
    • 2:4.3.9+dfsg-0ubuntu0.16.04.2
    • 2:4.3.9+dfsg-0ubuntu0.16.04.3
    • 2:4.3.11+dfsg-0ubuntu0.16.04.1
    • 2:4.3.11+dfsg-0ubuntu0.16.04.3
    • 2:4.3.11+dfsg-0ubuntu0.16.04.5
    • 2:4.3.11+dfsg-0ubuntu0.16.04.6
    • 2:4.3.11+dfsg-0ubuntu0.16.04.7
    • 2:4.3.11+dfsg-0ubuntu0.16.04.8
    • 2:4.3.11+dfsg-0ubuntu0.16.04.9
    • 2:4.3.11+dfsg-0ubuntu0.16.04.10
    • 2:4.3.11+dfsg-0ubuntu0.16.04.11
    • 2:4.3.11+dfsg-0ubuntu0.16.04.12
    • 2:4.3.11+dfsg-0ubuntu0.16.04.13
    • 2:4.3.11+dfsg-0ubuntu0.16.04.15
    • 2:4.3.11+dfsg-0ubuntu0.16.04.16
    • 2:4.3.11+dfsg-0ubuntu0.16.04.17
    • 2:4.3.11+dfsg-0ubuntu0.16.04.18
    • 2:4.3.11+dfsg-0ubuntu0.16.04.19
    • 2:4.3.11+dfsg-0ubuntu0.16.04.20
    • 2:4.3.11+dfsg-0ubuntu0.16.04.21
    • 2:4.3.11+dfsg-0ubuntu0.16.04.23
    • 2:4.3.11+dfsg-0ubuntu0.16.04.24
    • 2:4.3.11+dfsg-0ubuntu0.16.04.25
    • 2:4.3.11+dfsg-0ubuntu0.16.04.26
    • 2:4.3.11+dfsg-0ubuntu0.16.04.27
    • 2:4.3.11+dfsg-0ubuntu0.16.04.28
    • 2:4.3.11+dfsg-0ubuntu0.16.04.29
    • 2:4.3.11+dfsg-0ubuntu0.16.04.30
    • 2:4.3.11+dfsg-0ubuntu0.16.04.31
    • 2:4.3.11+dfsg-0ubuntu0.16.04.32
    • 2:4.3.11+dfsg-0ubuntu0.16.04.34
    • 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm1
    • 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm2
    • 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3
    • 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • samba Ubuntu:Pro:18.04:LTS

    Versions
    • 2:4.6.7+dfsg-1ubuntu3
    • 2:4.7.1+dfsg-1ubuntu1
    • 2:4.7.3+dfsg-1ubuntu1
    • 2:4.7.4+dfsg-1ubuntu1
    • 2:4.7.6+dfsg~ubuntu-0ubuntu1
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.4
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.5
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.6
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.7
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.9
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.10
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.11
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.13
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.15
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.16
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.17
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.18
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.19
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.20
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.21
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.23
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.24
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.26
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.27
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.28
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.29
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm1
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2
    • 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • samba Ubuntu:20.04:LTS

    Versions
    • 2:4.10.7+dfsg-0ubuntu2
    • 2:4.10.7+dfsg-0ubuntu3
    • 2:4.11.1+dfsg-3ubuntu1
    • 2:4.11.1+dfsg-3ubuntu2
    • 2:4.11.1+dfsg-3ubuntu4
    • 2:4.11.5+dfsg-1ubuntu1
    • 2:4.11.5+dfsg-1ubuntu2
    • 2:4.11.6+dfsg-0ubuntu1
    • 2:4.11.6+dfsg-0ubuntu1.1
    • 2:4.11.6+dfsg-0ubuntu1.2
    • 2:4.11.6+dfsg-0ubuntu1.3
    • 2:4.11.6+dfsg-0ubuntu1.4
    • 2:4.11.6+dfsg-0ubuntu1.5
    • 2:4.11.6+dfsg-0ubuntu1.6
    • 2:4.11.6+dfsg-0ubuntu1.8
    • 2:4.11.6+dfsg-0ubuntu1.9
    • 2:4.11.6+dfsg-0ubuntu1.10
    Affected ranges
    • ECOSYSTEM: < 2:4.13.14+dfsg-0ubuntu0.20.04.1

    Update to 2:4.13.14+dfsg-0ubuntu0.20.04.1

  • samba Ubuntu:22.04:LTS

    Versions
    • 2:4.13.5+dfsg-2ubuntu2
    • 2:4.13.5+dfsg-2ubuntu3
    Affected ranges
    • ECOSYSTEM: < 2:4.13.14+dfsg-0ubuntu1

    Update to 2:4.13.14+dfsg-0ubuntu1

Original sources

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