{"id":26344,"date":"2019-03-19T14:17:24","date_gmt":"2019-03-19T14:17:24","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/29947\/PuTTY-SSH-Client-Gets-Patched-After-RSA-Key-Exchange-Memory-Vuln-Spotted.html"},"modified":"2019-03-19T14:17:24","modified_gmt":"2019-03-19T14:17:24","slug":"putty-ssh-client-gets-patched-after-rsa-key-exchange-memory-vuln-spotted","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/putty-ssh-client-gets-patched-after-rsa-key-exchange-memory-vuln-spotted\/","title":{"rendered":"PuTTY SSH Client Gets Patched After RSA Key Exchange Memory Vuln Spotted"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/regmedia.co.uk\/2016\/01\/18\/car_98457654644.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p>Venerable SSH client PuTTY has received a pile of security patches, with its lead maintainer admitting to the <em>The Register<\/em> that one fixed a &#8220;&#8216;game over&#8217; level vulnerability&#8221;.<\/p>\n<p>The fixes implemented in PuTTY over the weekend include new features plugging a plethora of vulns in the Telnet and SSH client, most of which were uncovered as part of an EU-sponsored HackerOne bug bounty.<\/p>\n<p>Version <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/www.chiark.greenend.org.uk\/~sgtatham\/putty\/latest.html\">0.71<\/a> of PuTTY includes fixes for:<\/p>\n<ul>\n<li>A remotely triggerable memory overwrite in RSA key exchange, which can occur before host key verification<\/li>\n<li>Potential recycling of random numbers used in cryptography<\/li>\n<li>On Windows, hijacking by a malicious help file in the same directory as the executable<\/li>\n<li>On Unix, remotely triggerable buffer overflow in any kind of server-to-client forwarding<\/li>\n<li>multiple denial-of-service attacks that can be triggered by writing to the terminal<\/li>\n<\/ul>\n<p>Lead maintainer and &#8220;benevolent dictator&#8221; of all things PuTTY Simon Tatham told <em>El Reg<\/em> that &#8220;of all the things found by the EU bug bounty programme, the <u>most<\/u> serious was <code>vuln-dss-verify<\/code>. That really is a &#8216;game over&#8217; level vulnerability for a secure network protocol: a MITM attacker could bypass the SSH host key system completely.&#8221;<\/p>\n<p>&#8220;Luckily,&#8221; he continued, &#8220;it <a target=\"_blank\" href=\"https:\/\/www.chiark.greenend.org.uk\/~sgtatham\/putty\/wishlist\/vuln-dss-verify.html\">never appeared in a released version<\/a> of PuTTY: it was introduced during work to rewrite the crypto for side-channel safety, and spotted only a few weeks later by a bug-bounty participant, well before the release came out. So the EU protected almost everybody from that one.&#8221;<\/p>\n<p>Another one of the patched vulns was PuTTY <a target=\"_blank\" href=\"https:\/\/www.chiark.greenend.org.uk\/~sgtatham\/putty\/wishlist\/vuln-rsa-kex-integer-overflow.html\">not enforcing minimum key lengths during RSA key exchange<\/a>, creating an integer overflow situation. Tatham explained that this &#8220;could be triggered by a server whose host key hasn&#8217;t yet been authenticated. So you&#8217;d not only have been at risk from servers you actually <u>trust<\/u> turning out to be untrustworthy; you were also at risk from anyone who could MITM your connection to such a server, because the usual mechanism that protects you from MITM has not yet kicked in at that stage in the connection.&#8221;<\/p>\n<p>The other major vuln patched in v0.71 involved planting a malicious help file in the PuTTY root directory, something Tatham said wouldn&#8217;t have applied to those using the regular Windows .msi installer.<\/p>\n<p>Opened in January, the <a target=\"_blank\" href=\"https:\/\/hackerone.com\/putty_h1c?view_policy=true\">EU review of PuTTY<\/a> paid out more than $17,500 and was funded by the EU Directorate-General for Informatics, which describes itself as &#8220;providing digital services that support other Commission departments&#8221;. The bounty formed a wider part of the EU&#8217;s ongoing Free and Open Software Audit, or <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/joinup.ec.europa.eu\/collection\/eu-fossa-2\">FOSSA<\/a>. \u00ae<\/p>\n<p class=\"wptl btm\"><span>Sponsored:<\/span> <a href=\"https:\/\/go.theregister.co.uk\/tl\/1810\/-7145\/re-designing-linux-security-do-no-harm?td=wptl1810\">Re-designing Linux Security: Do No Harm<\/a><\/p>\n<p>READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/29947\/PuTTY-SSH-Client-Gets-Patched-After-RSA-Key-Exchange-Memory-Vuln-Spotted.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":26345,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[6234],"class_list":["post-26344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlineprivacyflawpatchcryptography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PuTTY SSH Client Gets Patched After RSA Key Exchange Memory Vuln Spotted 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, 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