CVE-2026-11774— 389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflow

389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflow

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

整数溢出或超界折返

389 Directory Server 输入验证错误漏洞

389 Directory Server是389 Directory Server开源的一个高度可用、功能齐全、可靠和安全的LDAP服务器实现。 389 Directory Server存在输入验证错误漏洞，该漏洞源于SASL I/O层整数溢出，在sasl_io_start_packet()中，将sizeof(uint32_t)添加到特制SASL数据包长度前缀0xFFFFFFFC导致无符号环绕为零，绕过nsslapd-maxsasliosize限制，导致堆缓冲区溢出，攻击者可控制约2兆字节数据，可能导致拒

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