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Graph/uniprint

Component

uniprint

uniprint

uniprint

Node Details

Public graph metadata

Updated5/2/2026

PageRank0.0000

Connections

4 linked nodes

WRITTEN_INLanguage

AFFECTSRootCause

the four sinks live inside upd_wrtrtl().

PERTAIN_TOProblem

takes user-controlled PostScript parameters (upWriteComponentCommands, upYMoveCommand) and passes them DIRECTLY as the format string argument — Ghostscript 'uniprint' device (devices/gdevupd.c). Tension: Attacker-supplied %s/%x/%n conversion specifiers yield arbitrary read & write primitives, bypassing -dSAFER and leading to RCE on a victim that renders a malicious PostScript/PDF. Outcome: upWriteComponentCommands, upYMoveCommand) and passes them DIRECTLY as the format string argument to gp_fprintf and gs_snprintf inside upd_wrtrtl (lines 7021, 7028, 7049, 7053) and similar writer functions.

PERTAIN_TOSolution

Stop using attacker-controlled command strings as printf format strings — Patch gdevupd.c so each of the four call sites emits the parameter as raw bytes.

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