Описание
Security update for dovecot24
This update for dovecot24 fixes the following issues:
- Update to v2.4.3
- CVE-2025-59028: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).
- CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing (bsc#1260895).
- CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).
- CVE-2026-24031: SQL injection possible if auth_username_chars is configured empty. Fixed escaping to always happen. v2.4 regression (bsc#1260896).
- CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).
- CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).
- CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).
- CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication (bsc#1260901).
- CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).
- CVE-2026-27860: LDAP query injection possible if auth_username_chars is configured empty. Fixed escaping to always happen. v2.4 regression (bsc#1260893).
Список пакетов
openSUSE Leap 16.0
Ссылки
- SUSE Security Ratings
- SUSE Bug 1260893
- SUSE Bug 1260894
- SUSE Bug 1260895
- SUSE Bug 1260896
- SUSE Bug 1260897
- SUSE Bug 1260898
- SUSE Bug 1260899
- SUSE Bug 1260900
- SUSE Bug 1260901
- SUSE Bug 1260902
- SUSE CVE CVE-2025-59028 page
- SUSE CVE CVE-2025-59031 page
- SUSE CVE CVE-2025-59032 page
- SUSE CVE CVE-2026-24031 page
- SUSE CVE CVE-2026-27855 page
- SUSE CVE CVE-2026-27856 page
- SUSE CVE CVE-2026-27857 page
- SUSE CVE CVE-2026-27858 page
- SUSE CVE CVE-2026-27859 page
Описание
When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2025-59028
- SUSE Bug 1260894
Описание
Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments. Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and subsequently ending up in FTS indexes. Do not use the provided script, instead, use something else like FTS tika. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2025-59031
- SUSE Bug 1260895
Описание
ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2025-59032
- SUSE Bug 1260902
Описание
Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-24031
- SUSE Bug 1260896
Описание
Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27855
- SUSE Bug 1260900
Описание
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27856
- SUSE Bug 1260899
Описание
Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Install fixed version, there is no other remediation. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27857
- SUSE Bug 1260898
Описание
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27858
- SUSE Bug 1260901
Описание
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27859
- SUSE Bug 1260897
Описание
If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.
Затронутые продукты
Ссылки
- CVE-2026-27860
- SUSE Bug 1260893