Title: Cisco IOS CHAP Authentication Vulnerabilities
Severity: HIGH
Description:
Cisco IOS software is reported prone to an authentication bypass vulnerability. This vulnerability presents itself in PPP CHAP authentication used by IOS. A remote attacker may bypass authentication to gain unauthorized access to vulnerable device. Cisco non-switch products with product numbers greater than or equal to 1000, AGS/AGS+/CGS/MGS, and CS-500 products are vulnerable to this issue.
Another vulnerability related to the issue described above affects Cisco IOS/700 software. This issue can allow a remote attacker to establish an unauthorized PPP connection to a device that is running the vulnerable application. This attack requires the device to be using CHAP authentication and the attacker needs to modify code for a vulnerable PPP/CHAP implementation.
Affected Products:
- Cisco IOS 10.3
- Cisco IOS 11.0
- Cisco IOS 11.1
- Cisco IOS 11.2
- Cisco IOS 11.2P
- Cisco IOS 9.1.0
- Cisco IOS/700 4.1.0
References:
- Cisco Systems: Cisco Product Security Incident Response
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