CVE-2021-23192
published 2022-03-02CVE-2021-23192: A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker…
PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCNIHAN
EPSS
1.95%
78.2th percentile
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | samba | < samba 2:4.13.14+dfsg-1 (bookworm) | samba 2:4.13.14+dfsg-1 (bookworm) |
| msrc | azl3_samba_4.18.3-1_on_azure_linux_3.0 | — | — |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
| samba | samba | — | — |
| samba | samba | >= 0 < 2:4.13.13+dfsg-1~deb11u2 | 2:4.13.13+dfsg-1~deb11u2 |
| samba | samba | >= 0 < 2:4.13.14+dfsg-1 | 2:4.13.14+dfsg-1 |
| samba | samba | >= 0 < 2:4.13.14+dfsg-1 | 2:4.13.14+dfsg-1 |
| samba | samba | >= 0 < 2:4.13.14+dfsg-1 | 2:4.13.14+dfsg-1 |
| samba | samba | >= 0 < 2:4.13.14+dfsg-0ubuntu0.20.04.4 | 2:4.13.14+dfsg-0ubuntu0.20.04.4 |
| samba | samba | >= 0 < 2:4.13.14+dfsg-0ubuntu0.20.04.3 | 2:4.13.14+dfsg-0ubuntu0.20.04.3 |
| samba | samba | >= 0 < 2:4.13.14+dfsg-0ubuntu0.20.04.1 | 2:4.13.14+dfsg-0ubuntu0.20.04.1 |
| samba | samba | >= 4.10.0 < 4.13.14 | 4.13.14 |
| samba | samba | >= 4.14.0 < 4.14.10 | 4.14.10 |
| samba | samba | >= 4.15.0 < 4.15.2 | 4.15.2 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N
osv7.5HIGH
vendor_debian7.5HIGH
vendor_msrc7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu5.9MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-vffc-r23p-p6rq: A flaw was found in the way samba implemented DCE/RPC
ghsa_unreviewed·2022-03-04
CVE-2021-23192 [HIGH] CWE-20 GHSA-vffc-r23p-p6rq: A flaw was found in the way samba implemented DCE/RPC
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
OSV
CVE-2021-23192: A flaw was found in the way samba implemented DCE/RPC
osv·2022-03-02·CVSS 7.5
CVE-2021-23192 [HIGH] CVE-2021-23192: A flaw was found in the way samba implemented DCE/RPC
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
OSV
samba regression
osv·2021-12-13·CVSS 5.9
[MEDIUM] samba regression
samba regression
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.
Original advisory details:
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
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. (CVE-2020-25717)
Andrew Bartlett discovered that Samba did not correctly sandbox
OSV
samba regressions
osv·2021-12-06·CVSS 5.9
[MEDIUM] samba regressions
samba regressions
USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes
introduced regressions in name mapping and backups.
Please see the following upstream bugs for more information:
https://bugzilla.samba.org/show_bug.cgi?id=14901
https://bugzilla.samba.org/show_bug.cgi?id=14918
This update fixes the problem.
Original advisory details:
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
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. (CVE-2020-25717)
Andrew Bartlett discovered that Samba
OSV
samba vulnerabilities
osv·2021-11-11·CVSS 5.9
CVE-2016-2124 [MEDIUM] samba vulnerabilities
samba vulnerabilities
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
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. (CVE-2020-25717)
Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos
tickets issues by an RODC. An RODC could print administrator tickets,
contrary to expectations. (CVE-2020-25718)
Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets.
Delegated administrators could possibly use this issue to impersonate
accounts, leading to total domain compromise.
Red Hat
kernel: USB: core: Make do_proc_control() and do_proc_bulk() killable
vendor_redhat·2024-06-19·CVSS 5.5
CVE-2021-47582 [MEDIUM] CWE-667 kernel: USB: core: Make do_proc_control() and do_proc_bulk() killable
kernel: USB: core: Make do_proc_control() and do_proc_bulk() killable
In the Linux kernel, the following vulnerability has been resolved:
USB: core: Make do_proc_control() and do_proc_bulk() killable
The USBDEVFS_CONTROL and USBDEVFS_BULK ioctls invoke
usb_start_wait_urb(), which contains an uninterruptible wait with a
user-specified timeout value. If timeout value is very large and the
device being accessed does not respond in a reasonable amount of time,
the kernel will complain about "Task X blocked for more than N
seconds", as found in testing by syzbot:
INFO: task syz-executor.0:8700 blocked for more than 143 seconds.
Not tainted 5.14.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:23192 pid: 8700 ppid: 84
Microsoft
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request and chose to fragment it an attacker could replace later fragments with their own
vendor_msrc·2022-03-08·CVSS 7.5
CVE-2021-23192 [HIGH] CWE-20 A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request and chose to fragment it an attacker could replace later fragments with their own
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request and chose to fragment it an attacker could replace later fragments with their own data bypassing the signature requirements.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional
Ubuntu
Samba regression
vendor_ubuntu·2021-12-13·CVSS 5.9
[MEDIUM] Samba regression
Title: Samba regression
Summary: USN-5142-1 introduced a regression in Samba.
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.
Original advisory details:
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
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. (CVE-2020-25717)
An
Ubuntu
Samba regressions
vendor_ubuntu·2021-12-06·CVSS 5.9
[MEDIUM] Samba regressions
Title: Samba regressions
Summary: USN-5142-1 introduced regressions in Samba.
USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes
introduced regressions in name mapping and backups.
Please see the following upstream bugs for more information:
https://bugzilla.samba.org/show_bug.cgi?id=14901
https://bugzilla.samba.org/show_bug.cgi?id=14918
This update fixes the problem.
Original advisory details:
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
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 mem
Ubuntu
Samba vulnerabilities
vendor_ubuntu·2021-11-11·CVSS 5.9
CVE-2020-25721 [MEDIUM] Samba vulnerabilities
Title: Samba vulnerabilities
Summary: Several security issues were fixed in Samba.
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
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. (CVE-2020-25717)
Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos
tickets issues by an RODC. An RODC could print administrator tickets,
contrary to expectations. (CVE-2020-25718)
Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets.
Delegated administrators could possibly use this issu
Red Hat
samba: Subsequent DCE/RPC fragment injection vulnerability
vendor_redhat·2021-11-09·CVSS 7.5
CVE-2021-23192 [HIGH] samba: Subsequent DCE/RPC fragment injection vulnerability
samba: Subsequent DCE/RPC fragment injection vulnerability
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
Mitigation: Setting
~~~
dcesrv:max auth states=0
~~~
in the smb.conf will provide some mitigation against this issue.
Package: samba (Red Hat Enterprise Linux 6) - Not affected
Package: samba (Red Hat Enterprise Linux 7) - Not affected
Packa
Debian
CVE-2021-23192: samba - A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba se...
vendor_debian·2021·CVSS 7.5
CVE-2021-23192 [HIGH] CVE-2021-23192: samba - A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba se...
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
Scope: local
bookworm: resolved (fixed in 2:4.13.14+dfsg-1)
bullseye: resolved (fixed in 2:4.13.13+dfsg-1~deb11u2)
forky: resolved (fixed in 2:4.13.14+dfsg-1)
sid: resolved (fixed in 2:4.13.14+dfsg-1)
trixie: resolved (fixed in 2:4.13.14+dfsg-1)
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.redhat.com/show_bug.cgi?id=2019666https://security.gentoo.org/glsa/202309-06https://ubuntu.com/security/CVE-2021-23192https://www.samba.org/samba/security/CVE-2021-23192.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=2019666https://security.gentoo.org/glsa/202309-06https://ubuntu.com/security/CVE-2021-23192https://www.samba.org/samba/security/CVE-2021-23192.html
2022-03-02
Published