Bug 2494772

Summary: CVE-2026-11785 389-ds-base: 389-ds-base: partial stack address information leak via ber_printf type confusion in SSO token handler [fedora-all]
Product: [Fedora] Fedora Reporter: Samuele Negrini <snegrini>
Component: 389-ds-baseAssignee: mreynolds
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: abokovoy, jachapma, mreynolds, spichugi, tbordaz, vashirov
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---Flags: fedora-admin-xmlrpc: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["8967e51f-8ebb-4767-837e-d6fc9915803c"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2485427    

Description Samuele Negrini 2026-06-30 07:23:18 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A type confusion bug in extop_handle_ldapssotoken_request() (extendop.c) passes a stack pointer (&rc) to ber_printf with format 'i' which expects an integer. The low 32 bits of a stack address are encoded into every SSO token LDAP extended operation response.

Any authenticated non-administrator user can extract partial stack address information. SSO token feature enabled by default with auto-generated secret (Issue #1797). PoC confirmed on Fedora 42: INTEGER=0x8e7faed8 leaked. Reduces stack ASLR entropy but is not a full bypass.