Improper Certificate Validation Enables Man‑in‑the‑Middle Attack in Sleipnir Mobile

Sleipnir Mobile for iPhone / iPad and Sleipnir Mobile for iPhone / iPad Black Edition provided by Fenrir Inc. are vulnerable to improper certificate verification. A man-in-the-middle attack may allow an attacker to eavesdrop on an encrypted communication.

Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing

Fenrir Sleipnir Browser for Android before 3.9.0 contains a UI spoofing vulnerability that allows remote attackers to impersonate the browser's trusted address bar by entering fullscreen mode via the Fullscreen API without displaying a persistent notification or trusted-origin indicator. Attackers can render a counterfeit address bar showing a trusted origin over attacker-controlled content after a single user tap, enabling credential harvesting, malware delivery, or social engineering through fake login, update, or payment pages.

Cross-zone scripting vulnerability in Sleipnir 2.49 and earlier, and Portable Sleipnir 2.45 and earlier, allows remote attackers to bypass Web content zone restrictions via certain script contained in RSS data. NOTE: some of these details are obtained from third party information.

Cross-site scripting (XSS) vulnerability in Fenriru (1) Sleipnir 2.5.17 R2 and earlier and (2) Grani 3.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the Search field in a search for additions to the Favorites section.

Untrusted search path vulnerability in Fenrir Sleipnir before 2.9.5 and Grani before 4.4 allows local users to gain privileges via a Trojan horse DLL in the current working directory.

Untrusted search path vulnerability in Fenrir Sleipnir 2.9.4 and earlier and Grani 4.3 and earlier allows local users to gain privileges via a Trojan horse executable file in the current working directory.