QID 150319

QID 150319: Weak Cookies in Use

Cookies are used to track HTTP sessions. Both session and non-session cookies could be persistent cookies in those cases it is important to verify the complexity of the cookie values.

Detection: WAS scan evaluates cookie length, analyzes for common cookie parameters not limited to PHPSESSID, ASP.NET_SessionId, JSESSIONID, sessionID and .

With weak cookie values, sessions can be predictable. Such cookies can be used by attacker and impersonate as a legitimate user to steal information or carry out some malicious operations.

Solution
Review cookies reported, all session cookies should have strong length, combination of alpha-number characters.

Use cryptographically secure pseudorandom number generator (CSPRNG) with a size of at least 128 bits and ensure that each sessionID is unique.

Verify non-session cookie values are strong, randomize as applicable.

Vendor References

CVEs related to QID 150319

Software Advisories
Advisory ID Software Component Link
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