Berkeley Yacc (byacc) 'skeleton.c' Local Denial of Service Vulnerability

Bugtraq ID:	30233
Class:	Boundary Condition Error
CVE:
Remote:	No
Local:	Yes
Published:	Jul 15 2008 12:00AM
Updated:	Jul 21 2008 10:58PM
Credit:	Otto Moerbeek
Vulnerable:	Robert Corbett Berkeley Yacc (byacc) 20070509 Pardus Linux 2008 0 Pardus Linux 2007 0 OpenBSD OpenBSD 2.9 OpenBSD OpenBSD 2.8 OpenBSD OpenBSD 2.7 OpenBSD OpenBSD 2.6 OpenBSD OpenBSD 2.5 OpenBSD OpenBSD 2.4 OpenBSD OpenBSD 2.3 OpenBSD OpenBSD 2.2 OpenBSD OpenBSD 2.1 OpenBSD OpenBSD 2.0 OpenBSD OpenBSD 4.3 OpenBSD OpenBSD 4.2 OpenBSD OpenBSD 4.1 OpenBSD OpenBSD 4.0 OpenBSD OpenBSD 3.9 OpenBSD OpenBSD 3.8 OpenBSD OpenBSD 3.7 OpenBSD OpenBSD 3.6 OpenBSD OpenBSD 3.5 OpenBSD OpenBSD 3.4 OpenBSD OpenBSD 3.3 OpenBSD OpenBSD 3.2 OpenBSD OpenBSD 3.1 OpenBSD OpenBSD 3.0 OpenBSD OpenBSD -current
Not Vulnerable:

Berkeley Yacc (byacc) 'skeleton.c' Local Denial of Service Vulnerability

Berkeley Yacc (byacc) is prone to a local denial-of-service vulnerability because out-of-bounds stack memory may be accessed.

Attackers can exploit this issue to deny service to legitimate users. Given the nature of this issue, attackers may also be able to execute arbitrary code, but this has not been confirmed.

This issue affects all versions of byacc; it was discovered in OpenBSD 4.3.

Berkeley Yacc (byacc) 'skeleton.c' Local Denial of Service Vulnerability

Currently we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Berkeley Yacc (byacc) 'skeleton.c' Local Denial of Service Vulnerability

Solution:
This issue was addressed in OpenBSD's CVS repository. Please see the references for more information.

Berkeley Yacc (byacc) 'skeleton.c' Local Denial of Service Vulnerability

References:

• Berkeley Yacc (byacc) Homepage (Robert Corbett)
  
• openbsd-cvs (Otto Moerbeek)
  
• RCS file: /usr/OpenBSD/cvs/src/usr.bin/yacc/skeleton.c,v (OpenBSD)