News
Vigil@nce: OpenSolaris, denial of service via proc
July 2009 by Vigil@nce
A local attacker on a x86 processor can use /proc in order to stop the system.
Severity: 1/4
Consequences: denial of service of computer
Provenance: user shell
Means of attack: no proof of concept, no attack
Ability of attacker: expert (4/4)
Confidence: confirmed by the editor (5/5)
Diffusion of the vulnerable configuration: high (3/3)
Creation date: 07/07/2009
IMPACTED PRODUCTS
OpenSolaris
DESCRIPTION OF THE VULNERABILITY
The proc file system, generally mounted on /proc, is used to directly access to system information.
Under a x86 processor, the LDT (Local Descriptor Table) is used to segment the memory of each process.
The ldt_rewrite_syscall() function of the usr/src/uts/i86pc/os/trap.c file updates the LDT of a process.
A local attacker can generate an error in ldt_rewrite_syscall() via /proc. Technical details are unknown.
A local attacker can therefore create a denial of service.
CHARACTERISTICS
Identifiers: 258888, 6781092, VIGILANCE-VUL-8843
http://vigilance.fr/vulnerability/OpenSolaris-denial-of-service-via-proc-8843
