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7.5Hoch

CVE-2026-18355389-ds-base: 389-ds-base: heap buffer overflow via sasl wrapped-record length lower-bound underflow in sasl_io_start_packet()

Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8; Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8; Red Hat Red Hat Directory Server 11.9 for RHEL 8; R… Veröffentlicht: (vor 2 Monaten)

Beschreibung

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), the wrapped-record length read from the wire is validated only against an upper bound. A small wire length (0, 1, or 2) produces an encrypted_buffer_count below the already-consumed encrypted_buffer_offset, causing an unsigned subtraction underflow in sasl_io_read_packet(). PR_Recv is then requested to read approximately 4 GiB into a 1024-byte heap buffer, resulting in a heap buffer overflow with attacker-controlled content. After a successful SASL bind with integrity protection (SSF > 0), a remote authenticated attacker can cause a denial of service or potentially achieve remote code execution. This flaw is distinct from CVE-2026-11774, whose fix only guards against upper-bound overflow.

Schwachstellentyp (CWE): CWE-191

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

HerstellerProduktVersionen
directory server 11.9 —
directory server 13.2 —
directory server e4s 11.5 —
directory server e4s 11.7 —
directory server e4s 12.2 —
directory server e4s 12.4 —
enterprise linux 8 —
enterprise linux 9 —
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 all versions
Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8 all versions
Red Hat Red Hat Directory Server 11.9 for RHEL 8 all versions
Red Hat Red Hat Directory Server 12 all versions
Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9 all versions
Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9 all versions
Red Hat Red Hat Directory Server 13 —
Red Hat Red Hat Directory Server 13.2 all versions
Red Hat Red Hat Enterprise Linux 10 all versions
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support all versions
Red Hat Red Hat Enterprise Linux 6 —
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support all versions
Red Hat Red Hat Enterprise Linux 8 all versions
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support all versions
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On all versions
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support all versions
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On all versions
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service all versions
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions all versions
Red Hat Red Hat Enterprise Linux 9 all versions
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions all versions
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions all versions
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support all versions
rhel aus 8.4 —
rhel aus 8.6 —
rhel e4s 8.8 —
rhel e4s 9.2 —
rhel e4s 9.4 —
rhel eus 9.6 —
rhel eus long life 8.4 —
rhel eus long life 8.6 —
rhel tus 8.8 —

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