Cisco Security Advisory: Cisco Web Security Appliance HTTP Length Denial of Service Vulnerability

Fabricante: CISCO
Fecha: 18/05/2016
Identificador: cisco-sa-20160518-wsa3
Cisco Security Advisory: Cisco Web Security Appliance HTTP Length Denial of Service Vulnerability
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Web Security Appliance HTTP Length Denial of Service Vulnerability Advisory ID: cisco-sa-20160518-wsa3 Revision 1.0 For Public Release 2016 May 18 16:00 UTC (GMT) +--------------------------------------------------------------------- Summary ======= A vulnerability in HTTP request parsing in Cisco AsyncOS for the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the proxy process unexpectedly restarts. The vulnerability occurs because the affected software does not properly allocate space for the HTTP header and any expected HTTP payload. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. An exploit could allow the attacker to cause a DoS condition when the proxy process unexpectedly reloads, which can cause traffic to be dropped. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160518-wsa3 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (SunOS) iQIVAwUBVzI0bK89gD3EAJB5AQJ3NRAA3fZtmhQZ1CLM9wpu08Oe1/xETVXNB7Es YPIeZk/7rNcZe0RjrvXxQoJcZrNkq6hnExNwRaGeiKSulCAmXHU46v2gB2mbhYdx FB7AYVXOHDKHZyEhCeZXRvq3sbIZu4A/AVPLZSADl3v35Jdwwo8G/pDt7lTQma6o +qvLYXhToSTZuJM2IOxY63TSwSD8rVueZYvcPOAbD5w529tHwhIhmJ/OM6mqdJks FcQ+p3qBhuJpv/UB3ffWrlVXCQgukW5al/6tYHUFNYETp/b7PqixWz/Xs5Ob7GRg Pa8JE6ggkdwUn0Z5LNbHpU46wZyUMaQMLGTMwVlpiBlz5dxbq41Llo/vu9//ozNu eFohMTKSR/l48u34gzeca6ffIkOmLv++nsM4xAnvJSnF4ooTOLoyqqEjghxIRAkR BRrvLiy6SWKTuimpP0fhwGgGio7gDFP+nwdbgqXvx6JrEFCuc2rmHILLGH9CHWzH /sKzWekfJOXRN+w/m2aIRqJ0tj//2MLOYldxtX4G61MdhKgnGk/f9DyEuUP65+iu Kru4HMw8V+/OX5t+X0E02LfpKgMmOFKf3ZF00FvTLTOsi92ybBqw+OtuI+zY/x58 H9CZOTgqtreHpSiq2ItkUHOLIG5/d7oObop/Yk6ZvsYBsApXQfr+IU4WfdMaRstp CcNZWjXOX10= =Jy8r -----END PGP SIGNATURE-----