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Customers of Horde Webmail are being urged to disable a characteristic to include a nine-year-old unpatched safety vulnerability within the software program that might be abused to achieve full entry to e-mail accounts just by previewing an attachment.
“This provides the attacker entry to all delicate and maybe secret info a sufferer has saved of their e-mail account and will permit them to achieve additional entry to the inner providers of a company,” SonarSource vulnerability researcher, Simon Scannell, mentioned in a report.
An “all volunteer venture,” the Horde Venture is a free, browser-based communication suite that permits customers to learn, ship, and manage e-mail messages in addition to handle and share calendars, contacts, duties, notes, recordsdata, and bookmarks.
The flaw, which was launched as a part of a code change pushed on November 30, 2012, pertains to a case of an “uncommon” saved cross-site scripting flaw (aka persistent XSS) that permits an adversary to craft an OpenOffice doc in such a way that when it is previewed, it robotically executes arbitrary JavaScript payload.
Saved XSS assaults come up when a malicious script is injected immediately right into a susceptible internet utility’s server, reminiscent of a remark discipline of an internet site, inflicting the untrusted code to be retrieved and transmitted to the sufferer’s browser each time the saved info is requested.
“The vulnerability triggers when a focused person views an hooked up OpenOffice doc within the browser,” Scannell mentioned. “Because of this, an attacker can steal all emails the sufferer has despatched and obtained.”
Even worse, ought to an administrator account with a personalised, malicious e-mail is efficiently compromised, the attacker may abuse this privileged entry to take over the complete webmail server.
The shortcoming was initially reported to the venture maintainers on August 26, 2021, however up to now no fixes have been shipped regardless of affirmation from the seller acknowledging the flaw. We now have reached out to Horde for additional remark, and we are going to replace if we hear again.
Within the interim, Horde Webmail customers are suggested to disable the rendering of OpenOffice attachments by modifying the config/mime_drivers.php file so as to add the ‘disable’ => true configuration choice to OpenOffice mime handler.
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