-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Security Advisory: Cisco StarOS SSH Privilege Escalation Vulnerability Advisory ID: cisco-sa-20170315-asr Revision: 1.0 For Public Release: 2017 March 15 16:00 GMT Last Updated: 2017 March 15 16:00 GMT CVE ID(s): CVE-2017-3819 CVSS Score v(3): 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H +--------------------------------------------------------------------- Summary ======= A privilege escalation vulnerability in the Secure Shell (SSH) subsystem in the StarOS operating system for Cisco ASR 5000 Series, ASR 5500 Series, ASR 5700 Series devices, and Cisco Virtualized Packet Core could allow an authenticated, remote attacker to gain unrestricted, root shell access. The vulnerability is due to missing input validation of parameters passed during SSH or SFTP login. An attacker could exploit this vulnerability by providing crafted user input to the SSH or SFTP command-line interface (CLI) during SSH or SFTP login. An exploit could allow an authenticated attacker to gain root privileges access on the router. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered via both IPv4 and IPv6 traffic. An established TCP connection toward port 22, the SSH default port, is needed to perform the attack. The attacker must have valid credentials to login to the system via SSH or SFTP. Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asr ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asr";] -----BEGIN PGP SIGNATURE----- iQKBBAEBAgBrBQJYyWVsZBxDaXNjbyBTeXN0ZW1zIFByb2R1Y3QgU2VjdXJpdHkg SW5jaWRlbnQgUmVzcG9uc2UgVGVhbSAoQ2lzY28gUFNJUlQga2V5IDIwMTYtMjAx NykgPHBzaXJ0QGNpc2NvLmNvbT4ACgkQrz2APcQAkHlB4A//abxGCJXva4/bR/wn 5QMis+qjShEQId3TAqA3+YFFP4u1JGAFRDm77ieE0vJVSYDWJ3hGSNttYq1Pt+e0 yMCbX1pXSN29nNvoTL2yORnYGBhYKEK2MmJXpjz0exPh4r+Is5s+JAB2bIJdVMip e4pPLOkZm8B008/7OgkCdBqY5TEo3X41m5HTq7RYSglf5pTfkM6O04U8pEIh8KOv oi9gI3JVTj/Yh7EtJkLU6CNygg6INfY9B9EUV5Ctfus7AZfvPLzdG4Jl+57mrPWl tKCgCLsSUYvW/28TlRP72pwVoKWzLg2zhW1j98GAwUIfQXw6bt9jgAma2p8ZTiCa 5LMWmOsrvaw8G6jfxr3ligTxoSGRikXfItZIMkWe0YuiS9aXQBwdcu7WwSyneM0J vtYqSsF/ktsMRrE3YhtrUw6GmQ/5zw9FsizcWWG2O4kAd0U02E+Mw+aPi7HvN92G +fPO0OaWakr4fAfxWF2rPcEnGg8idPT6BbSLvf+B330GPOiYGZP0M4kJwxZe7t25 obpM3LJptZjN129fOGj/GlC4e+xYc+UOug/8lgyRR4Q9znSjd8o0lSyFQfcIwOmt 8NETMaT9p8CLyUyvyQ1/S4XyP3RriqTjn8OE6lq71ZRGpRIQ6N8xIVxaD0OBDcks g41Iqe0GD5yQFsXypTAn7dc9bNg= =Lk6U -----END PGP SIGNATURE-----
