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openSUSE-SU-2026:21238-1

Опубликовано: 05 июл. 2026
Источник: suse-cvrf

Описание

Security update for krb5

This update for krb5 fixes the following issue

  • CVE-2026-11850: integer underflow in berval2tl_data() leads to heap out-of-bounds read (bsc#1268131).

Список пакетов

openSUSE Leap 16.0
krb5-1.21.3-160000.4.1
krb5-client-1.21.3-160000.4.1
krb5-devel-1.21.3-160000.4.1
krb5-plugin-kdb-ldap-1.21.3-160000.4.1
krb5-plugin-preauth-otp-1.21.3-160000.4.1
krb5-plugin-preauth-pkinit-1.21.3-160000.4.1
krb5-plugin-preauth-spake-1.21.3-160000.4.1
krb5-server-1.21.3-160000.4.1

Ссылки

Описание

An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read. The attack vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len < 2, triggering the underflow when the KDC or kadmind reads principal data.

Затронутые продукты
openSUSE Leap 16.0:krb5-1.21.3-160000.4.1
openSUSE Leap 16.0:krb5-client-1.21.3-160000.4.1
openSUSE Leap 16.0:krb5-devel-1.21.3-160000.4.1
openSUSE Leap 16.0:krb5-plugin-kdb-ldap-1.21.3-160000.4.1
Ссылки