CVE-2020-12673
published 2020-08-12CVE-2020-12673: In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.
PriorityP341high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
6.19%
92.7th percentile
In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.
Affected
19 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | debian_linux | — | — |
| debian | debian_linux | — | — |
| debian | dovecot | < dovecot 1:2.3.11.3+dfsg1-1 (bookworm) | dovecot 1:2.3.11.3+dfsg1-1 (bookworm) |
| dovecot | dovecot | < 2.3.11.3 | 2.3.11.3 |
| dovecot | dovecot | >= 0 < 1:2.3.11.3+dfsg1-1 | 1:2.3.11.3+dfsg1-1 |
| dovecot | dovecot | >= 0 < 1:2.3.11.3+dfsg1-1 | 1:2.3.11.3+dfsg1-1 |
| dovecot | dovecot | >= 0 < 1:2.3.11.3+dfsg1-1 | 1:2.3.11.3+dfsg1-1 |
| dovecot | dovecot | >= 0 < 1:2.3.11.3+dfsg1-1 | 1:2.3.11.3+dfsg1-1 |
| dovecot | dovecot | >= 0 < 1:2.2.22-1ubuntu2.13 | 1:2.2.22-1ubuntu2.13 |
| dovecot | dovecot | >= 0 < 1:2.2.33.2-1ubuntu4.6 | 1:2.2.33.2-1ubuntu4.6 |
| dovecot | dovecot | >= 0 < 1:2.3.7.2-1ubuntu3.2 | 1:2.3.7.2-1ubuntu3.2 |
| dovecot | dovecot | >= 0 < 1:2.2.9-1ubuntu2.6+esm3 | 1:2.2.9-1ubuntu2.6+esm3 |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
osv7.5HIGH
vendor_debian7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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GHSA
GHSA-25jr-qm4x-mvhx: In Dovecot before 2
ghsa_unreviewed·2022-05-24
CVE-2020-12673 [MEDIUM] CWE-125 GHSA-25jr-qm4x-mvhx: In Dovecot before 2
In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.
OSV
dovecot vulnerabilities
osv·2020-08-17·CVSS 7.5
CVE-2020-12100 [HIGH] dovecot vulnerabilities
dovecot vulnerabilities
USN-4456-1 fixed several vulnerabilities in Dovecot. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)
It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)
It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-20
OSV
CVE-2020-12673: In Dovecot before 2
osv·2020-08-12·CVSS 7.5
CVE-2020-12673 [HIGH] CVE-2020-12673: In Dovecot before 2
In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.
OSV
dovecot vulnerabilities
osv·2020-08-12·CVSS 7.5
CVE-2020-12100 [HIGH] dovecot vulnerabilities
dovecot vulnerabilities
It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)
It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)
It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)
Ubuntu
Dovecot vulnerabilities
vendor_ubuntu·2020-08-17·CVSS 7.5
CVE-2020-12100 [HIGH] Dovecot vulnerabilities
Title: Dovecot vulnerabilities
Summary: Several security issues were fixed in Dovecot.
USN-4456-1 fixed several vulnerabilities in Dovecot. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)
It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)
It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
c
Red Hat
dovecot: Out of bound reads in dovecot NTLM implementation
vendor_redhat·2020-08-12·CVSS 7.5
CVE-2020-12673 [HIGH] CWE-125 dovecot: Out of bound reads in dovecot NTLM implementation
dovecot: Out of bound reads in dovecot NTLM implementation
In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.
A flaw was found in dovecot. An out-of-bounds read flaw was found in the way dovecot handled NTLM authentication allowing an attacker to crash the dovecot auth process repeatedly preventing login. The highest threat from this vulnerability is to system availability.
Mitigation: Upstream suggests that this flaw can be mitigated by disabling NTLM authentication. NTLM authentication can be disabled by using the configuration parameter "auth_mechanisms". More details available at: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
Package: dovecot (Red Hat Enterpris
Ubuntu
Dovecot vulnerabilities
vendor_ubuntu·2020-08-12·CVSS 7.5
CVE-2020-12100 [HIGH] Dovecot vulnerabilities
Title: Dovecot vulnerabilities
Summary: Several security issues were fixed in Dovecot.
It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)
It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)
It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)
Instructions: In general, a standard system update will make all the necess
Debian
CVE-2020-12673: dovecot - In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will cras...
vendor_debian·2020·CVSS 7.5
CVE-2020-12673 [HIGH] CVE-2020-12673: dovecot - In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will cras...
In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.
Scope: local
bookworm: resolved (fixed in 1:2.3.11.3+dfsg1-1)
bullseye: resolved (fixed in 1:2.3.11.3+dfsg1-1)
forky: resolved (fixed in 1:2.3.11.3+dfsg1-1)
sid: resolved (fixed in 1:2.3.11.3+dfsg1-1)
trixie: resolved (fixed in 1:2.3.11.3+dfsg1-1)
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation [fedora-all]
bugzilla·2020-08-13·CVSS 7.5
CVE-2020-12673 [HIGH] CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation [fedora-all]
CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported
Bugzilla
CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation
bugzilla·2020-08-05·CVSS 7.5
CVE-2020-12673 [HIGH] CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation
CVE-2020-12673 dovecot: Out of bound reads in dovecot NTLM implementation
As per upstream:
Vulnerability Details:
Dovecot's NTLM implementation does not correctly check message buffer size, which leads to reading past allocation which can lead to crash.
Risk:
An adversary can use this vulnerability to crash dovecot auth process repeatedly, preventing login.
Discussion:
Created attachment 1710594
Upstream patch
---
Mitigation:
Upstream suggests that this flaw can be mitigated by disabling NTLM authentication. NTLM authentication can be disabled by using the configuration parameter "auth_mechanisms". More details available at: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
---
Acknowledgments:
Name: the Dovecot project
---
External Referen
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00048.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00059.htmlhttps://dovecot.org/securityhttps://lists.debian.org/debian-lts-announce/2020/08/msg00024.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AAX2MJEULPVSRZOBX3PNPFSYP4FM4TT/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EYZU6CHA3VMYYAUCMHSCCQKJEVEIKPQ2/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XKKAL3OMG76ZZ7CIEMQP2K6KCTD2RAKE/https://security.gentoo.org/glsa/202009-02https://usn.ubuntu.com/4456-1/https://usn.ubuntu.com/4456-2/https://www.debian.org/security/2020/dsa-4745https://www.openwall.com/lists/oss-security/2020/08/12/2http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00048.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00059.htmlhttps://dovecot.org/securityhttps://lists.debian.org/debian-lts-announce/2020/08/msg00024.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4AAX2MJEULPVSRZOBX3PNPFSYP4FM4TT/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EYZU6CHA3VMYYAUCMHSCCQKJEVEIKPQ2/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XKKAL3OMG76ZZ7CIEMQP2K6KCTD2RAKE/https://security.gentoo.org/glsa/202009-02https://usn.ubuntu.com/4456-1/https://usn.ubuntu.com/4456-2/https://www.debian.org/security/2020/dsa-4745https://www.openwall.com/lists/oss-security/2020/08/12/2
2020-08-12
Published