{"id":39778,"date":"2021-02-22T15:59:39","date_gmt":"2021-02-22T15:59:39","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/32042\/Python-Hurries-Out-Update-To-Tackle-Remote-Code-Execution-Vulnerability.html"},"modified":"2021-02-22T15:59:39","modified_gmt":"2021-02-22T15:59:39","slug":"python-hurries-out-update-to-tackle-remote-code-execution-vulnerability","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/python-hurries-out-update-to-tackle-remote-code-execution-vulnerability\/","title":{"rendered":"Python Hurries Out Update To Tackle Remote Code Execution Vulnerability"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/www.zdnet.com\/a\/hub\/i\/r\/2020\/10\/02\/bfa3daa3-c083-4d5d-a449-fa225e70792a\/thumbnail\/770x578\/cc8794915e22a3f076de23f994da8e61\/developeristock-629960008a.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p>The Python Software Foundation (PSF) has rushed out Python 3.9.2 and 3.8.8 to address two notable security flaws, including one that is remotely exploitable but in practical terms can only be used to knock a machine offline.&nbsp;<\/p>\n<p>PSF is urging its legion of Python users to <a href=\"https:\/\/blog.python.org\/2021\/02\/python-392-and-388-are-now-available.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">upgrade systems to Python 3.8.8 or 3.9.2<\/a>, in particular to address the remote code execution (RCE) vulnerability that&#8217;s tracked as CVE-2021-3177.&nbsp;<\/p>\n<p>The project expedited the release after receiving unexpected pressure from some users who were concerned over the security flaw.&nbsp;<\/p>\n<p><strong>SEE: <\/strong><a href=\"https:\/\/www.techrepublic.com\/resource-library\/whitepapers\/hiring-kit-python-developer\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\"><strong>Hiring Kit: Python developer<\/strong><\/a><strong> (TechRepublic Premium)<\/strong><\/p>\n<p>&#8220;Since the announcement of the release candidates for 3.9.2 on 3.8.8, we received a number of inquiries from end users urging us to expedite the final releases due to the security content, especially&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-3177\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2021-3177<\/a>,&#8221; said the Python release team.<\/p>\n<p>&#8220;This took us somewhat by surprise since we believed security content is cherry-picked by downstream distributors from source either way, and the RC releases provide installers for everybody else interested in upgrading in the meantime,&#8221; PSF said.<\/p>\n<p>&#8220;It turns out that release candidates are mostly invisible to the community and in many cases cannot be used due to upgrade processes which users have in place.&#8221;<\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_zd_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\"> <\/section>\n<p>Python 3.x through to 3.9.1 has a buffer overflow in PyCArg_repr in ctypes\/callproc.c, which may lead to remote code execution.&nbsp;<\/p>\n<p>It affects Python applications that &#8220;accept floating-point numbers as untrusted input, as demonstrated by a 1e300 argument to c_double.from_param.&#8221;<\/p>\n<p>The bug occurs because &#8220;sprintf&#8221; is used unsafely. The impact is broad because Python is pre-installed with multiple Linux distributions and Windows 10. &nbsp;<\/p>\n<p>Various Linux distributions, <a href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2021-3177\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">such as Debian<\/a>, have been backporting the security patches to ensure the built-in versions of Python are shielded.&nbsp;<\/p>\n<p>The vulnerability is a common memory flaw. <a href=\"https:\/\/access.redhat.com\/security\/cve\/cve-2021-3177\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">Per RedHat<\/a>, a stack-based buffer overflow in Python&#8217;s ctypes module improperly validated the input passed to it, &#8220;which would allow an attacker to overflow a buffer on the stack and crash the application.&#8221;<\/p>\n<p><strong>SEE: <\/strong><a href=\"https:\/\/www.zdnet.com\/video\/developer-rust-programming-language-is-being-used-for-bigger-projects\/\"><strong>Developer: Rust programming language is being used for bigger projects<\/strong><\/a><\/p>\n<p>While a remote code execution vulnerability is bad news, RedHat notes that the &#8220;highest threat from this vulnerability is to system availability.&#8221; In other words, an attacker would likely only be able to pull off a denial of service attack. &nbsp;<\/p>\n<p>&#8220;Our understanding is that while the CVE is listed as &#8220;remote code execution&#8221;, practical exploits of this vulnerability as such are very unlikely due the following conditions needing to be met for successful RCE,&#8221; said the PSF.&nbsp;<\/p>\n<p>&#8220;To be sure, denial of service through malicious input is also a serious issue. Thus, to help the community members for whom the release candidate was insufficient, we are releasing the final versions of 3.9.2 and 3.8.8 today,&#8221; the organization added.&nbsp;<\/p>\n<p>The other flaw is tracked as&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-23336\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2021-23336<\/a>&nbsp;and concerns a web cache poisoning vulnerability by &#8220;defaulting the query args separator to &amp;, and allowing the user to choose a custom separator.&#8221;&nbsp;<\/p>\n<div class=\"relatedContent alignNone\">\n<h3 class=\"heading\"> <span class=\"int\">Open Source<\/span> <\/h3>\n<\/p><\/div>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/32042\/Python-Hurries-Out-Update-To-Tackle-Remote-Code-Execution-Vulnerability.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":39779,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[1011],"class_list":["post-39778","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlineflawpatch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Python Hurries Out Update To Tackle Remote Code Execution Vulnerability 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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