Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. Prior to 7.1.3, the function-source escaping logic does not neutralize a bare closing-script prefix when attacker-influenced function source text ends exactly at that prefix. Because each function body is escaped independently, a delimiter supplied by surrounding serialized output can terminate an HTML script element, and a later serialized value supplies injected markup that becomes a live element in the page.
Exploitation requires control of a serialized function's source text, such as through a spoofed toString(). This issue is fixed in version 7.1.3.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70…
security-advisories@github.com
https://github.com/yahoo/serialize-javascript/pull/235
security-advisories@github.com
https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.3
security-advisories@github.com
https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h…
security-advisories@github.com