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An RCE vulnerability within the node.js module is not going to be mounted
A vital vulnerability impacting safer-eval runs the danger of impacting over 36,000 tasks dependant on the node JS library, a software program engineer has warned.
The bug – CVE-2019-10769 – might result in various points, together with a sandbox bypass, cross-site scripting (XSS), or distant code execution (RCE), Jonathan Leitschuh, software program engineer at Gradle, disclosed yesterday (December 9) over Twitter.
Over 36,000 tasks use the weak library, Leitschuh famous. All variations are impacted and in accordance with a GitHub advisory revealed late final week, no patch has been issued.
Safer-Eval is a node.js library open sourced below the MIT license and designed as an alternative choice to the JS customary library’s eval perform.
It’s supposed to judge JavaScript in a sandbox, permitting some expressions, whereas throwing others away in an effort to forestall XSS and RCE.
As described by developer Robert Webb, the essential eval perform is taken into account by some as “just one letter away from evil.” By together with the eval perform in a code base, he says, “you can be encouraging future builders to make use of it for dangerous functions.”
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On December 6, the bundle writer revealed a warning to safer-eval customers – of which there have been over 50,000 downloads in the course of the previous week from the code repository – that the module needs to be thought of “dangerous”.
“Earlier than utilizing this module, ask your self if there aren’t any higher choices than utilizing safer-eval,” the advisory mentioned.
“It’s probably higher than the dangerous previous however has dangerous potential”.
The identical warning has been revealed on the safer-eval GitHub undertaking web page.
This doubtless pertains to the current launch of proof-of-concept (PoC) exploit code capable of abuse a vital safer-eval vulnerability.
In April, GitHub person XmiliaH additionally revealed PoC code capable of trigger a sandbox breakout in vm2 by way of the era of a spread error.
As soon as examined by XmiliaH, nonetheless, they branded using a spread error as “overkill,” resulting in a less complicated PoC being written and revealed by the developer.
Earlier variations of safer-eval – 1.three.three and beneath – have been moreover discovered to be weak to a sandbox bypass and RCE assault by malicious payloads capable of tamper with constructor strings.
This vulnerability is tracked as CVE-2019-10759 and was made public in July.
Within the absence of patch improvement for the brand new exploit, safer-eval has beneficial vm2 in its place and has inspired the general public posting of exploits in opposition to the module with a purpose to “assist others to construct a greater sandbox”.
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