Cisco Security Advisory: Cisco Web Security Appliance Connection Denial of Service Vulnerability

Fabricante: CISCO
Fecha: 18/05/2016
Identificador: cisco-sa-20160518-wsa4
Cisco Security Advisory: Cisco Web Security Appliance Connection Denial of Service Vulnerability
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Web Security Appliance Connection Denial of Service Vulnerability Advisory ID: cisco-sa-20160518-wsa4 Revision 1.0 For Public Release 2016 May 18 16:00 UTC (GMT) +--------------------------------------------------------------------- Summary ======= A vulnerability in Cisco AsyncOS for the Cisco Web Security Appliance (WSA) when the software handles a specific HTTP response code could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an appliance because the appliance runs out of system memory. The vulnerability occurs because the software does not free client and server connection memory and system file descriptors when a certain HTTP response code is received in the HTTP request. 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 because the appliance runs out of system memory. When this happens, the device can no longer accept new incoming connection requests. Cisco has released software updates that address this vulnerability. A workaround that addresses this vulnerability is also available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160518-wsa4 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (SunOS) iQIVAwUBVzI0k689gD3EAJB5AQIFTw//SVvwy5A6X4SY/r95dKR7bw6PhsZWlAyI WkDUis7GTqaGtVQWBDJi4Dv2gzI53/i3y97fXlwqvxv+B/nj6L2AhJjH6j5wWtca cplmOdDLSYupLp6jO+sQV4HXRMoDLCbLNkXsqSRjPsVPg+5U6DFVDzz2X+B7f1Rs v6yw7hPpuujq71ZbnqhxNBX4Xl8h6BDzmGOtQq4V76Bjv48lN4ItI0wwpZ9ZShLn 3wky7iAhLZKwOazdYGNE13eyVCBhKHbIHZ3pgG8jkpBHizR/xCwp8K2D94JxTx3u Gu+9GbFh4y3RQguA6QOCeI2aSThcKC3Ial7+bgnVX3+K9Kqwi3G+/fmjN8dXMxke Y1FyRs/V9JT8dbVPqPhvE5cghlF3+9XIUiXMDVgkUvG69ZrmvlgPVIMCN55vHzfD siaoBjyk4FOOzINzIypmnZAkZoyRoTghNQRG4Mc7rzy2dpKN+WYhFEY391i6aU5j ZeYem0LS+BpFpUv1XrqEsQc6ND46Djsy6tCE30WY1u87QDXG99D9O76q16neM0Kc qHv/wSZNS3I5hAdLq+JB6OJh31X5ZuiUlFdZumYw3u4fb/ehkjQ98ek2G9YDKMVO nXMc0Aq8cWidUjP/RWnLFwvSX8TyfP3wuZAPeGk50mz1VhnBE1VzuYUXJKp1fXyc QHExA8KC4xI= =4sxz -----END PGP SIGNATURE-----