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GHSA-q5f6-qxm2-mcqm
No affected components available
Summary
A potential Regular Expression Denial of Service (ReDoS) vulnerability was identified in tarteaucitron.js in the handling of the issuu_id parameter.
Details
The issue was caused by the use of insufficiently constrained regular expressions applied to attacker-controlled input:
if (issuu_id.match(/\d+\/\d+/)) {
issuu_embed = '#' + issuu_id;
} else if (issuu_id.match(/d=(.*)&u=(.*)/)) {
issuu_embed = '?' + issuu_id;
}
These expressions are not anchored and rely on greedy patterns (.*). When evaluated against specially crafted input, they may cause excessive backtracking, leading to high CPU consumption and potential denial of service.
Impact
An attacker able to control the issuu_id parameter could exploit this vulnerability to degrade performance or cause temporary service unavailability through CPU exhaustion.
No confidentiality or integrity impact was identified.
Fix https://github.com/AmauriC/tarteaucitron.js/commit/f0bbdac2fdf3cd24a325fc0928c0d34abf1b7b52
The logic was simplified and hardened by removing ambiguous regular expressions and enforcing strict input validation:
if (issuu_id.match(/^\d+\/\d+$/)) {
issuu_embed = '#' + issuu_id;
} else {
issuu_embed = '?' + issuu_id;
}
This change eliminates the risk of catastrophic backtracking and prevents ReDoS conditions.
Additionally, code related to the legacy "Alexa Rank" service was removed. This service, historically provided by Alexa.com via browser toolbars and popularity rankings, has been deprecated for several years and is no longer operational. The Alexa domain is now exclusively associated with the Amazon voice assistant, and the original ranking service has been permanently discontinued.
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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