CVE-2020-12674
published 2020-08-12CVE-2020-12674: In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled.
PriorityP342high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
6.19%
92.7th percentile
In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled.
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
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.
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
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
Red Hat
dovecot: Crash due to assert in RPA implementation
vendor_redhat·2020-08-12·CVSS 7.5
CVE-2020-12674 [HIGH] CWE-125 dovecot: Crash due to assert in RPA implementation
dovecot: Crash due to assert in RPA implementation
In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled.
A flaw was found in dovecot. An attacker can use the way dovecot handles RPA (Remote Passphrase Authentication) to crash the authentication 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 RPA (Remote Passphrase Authentication). RPA 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 Enterprise Linux 5) - Not aff
Debian
CVE-2020-12674: dovecot - In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash...
vendor_debian·2020·CVSS 7.5
CVE-2020-12674 [HIGH] CVE-2020-12674: dovecot - In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash...
In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled.
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)
GHSA
GHSA-h779-883h-mr35: In Dovecot before 2
ghsa_unreviewed·2022-05-24
CVE-2020-12674 [MEDIUM] CWE-125 GHSA-h779-883h-mr35: In Dovecot before 2
In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled.
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
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)
OSV
CVE-2020-12674: In Dovecot before 2
osv·2020-08-12·CVSS 7.5
CVE-2020-12674 [HIGH] CVE-2020-12674: In Dovecot before 2
In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-12674 dovecot: Crash due to assert in RPA implementation [fedora-all]
bugzilla·2020-08-13·CVSS 7.5
CVE-2020-12674 [HIGH] CVE-2020-12674 dovecot: Crash due to assert in RPA implementation [fedora-all]
CVE-2020-12674 dovecot: Crash due to assert in RPA 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 version
Bugzilla
CVE-2020-12674 dovecot: Crash due to assert in RPA implementation
bugzilla·2020-08-05·CVSS 7.5
CVE-2020-12674 [HIGH] CVE-2020-12674 dovecot: Crash due to assert in RPA implementation
CVE-2020-12674 dovecot: Crash due to assert in RPA implementation
As per upstream:
Vulnerability Details:
Dovecot's RPA mechanism implementation accepts zero-length message, which leads to assert-crash later on
Risk:
An adversary can use this vulnerability to crash dovecot auth process repeatedly, preventing login.
Discussion:
Created attachment 1710595
Upstream patch
---
Acknowledgments:
Name: the Dovecot project
---
Mitigation:
Upstream suggests that this flaw can be mitigated by disabling RPA (Remote Passphrase Authentication). RPA can be disabled by using the configuration parameter "auth_mechanisms". More details available at: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
---
External References:
https://dovecot.org/pipermail/dov
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/2020/08/12/3http://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/2020/08/12/3
2020-08-12
Published