A vulnerability in LibSass could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability exists in the IMPLEMENT_AST_OPERATORS expansion functions, as defined in the ast.cpp source code file, and is due to improper memory operations that are performed by the affected software. An attacker could exploit the vulnerability by sending a crafted Syntactically Awesome Style Sheets (SASS) file that submits malicious input to the targeted system. A successful exploit could trigger a stack overflow condition, which could cause a DoS condition.
The vendor has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, the attacker may use misleading language or instructions to persuade a user to access a SASS file that submits malicious input to the targeted system.
Administrators are advised to allow only trusted users to have network access.
Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.
Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.
Administrators are advised to use an unprivileged account when browsing the Internet.
Administrators are advised to monitor critical systems.
The vendor has released an issue report at the following link: Issue 2660
At the time this alert was first published, the vendor had not released software updates.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.