Published on: 2025-05-23 09:07:44
oss-sec mailing list archives Three bypasses of Ubuntu's unprivileged user namespace restrictions Qualys Security Advisory Three bypasses of Ubuntu's unprivileged user namespace restrictions ======================================================================== Contents ======================================================================== Summary Bypass via aa-exec Bypass via busybox Bypass via LD_PRELOAD Acknowledgments Timeline (advisory sent to the Ubuntu Security Team on January 15, 2
Keywords: namespace namespaces ubuntu unprivileged user
Find related items on AmazonPublished on: 2025-05-24 22:14:34
Three security bypasses have been discovered in Ubuntu Linux’s unprivileged user namespace restrictions, which could be enable a local attacker to exploit vulnerabilities in kernel components. The issues allow local unprivileged users to create user namespaces with full administrative capabilities and impact Ubuntu versions 23.10, where unprivileged user namespaces restrictions are enabled, and 24.04 which has them active by default. Linux user namespaces allow users to act as root inside an i
Keywords: namespace qualys restrictions ubuntu user
Find related items on AmazonPublished on: 2025-05-28 13:35:46
Why build a new low-level container runtime? The idea of separating the low-level container runtime concerns into its own tool or microservice is not new. Outside of the Kubernetes CRI, which presents container lifecycle management as a pluggable microservice, there are simpler tools which provide a low-level container runtime as well, such as the unshare utility in util-linux, as well as another tool called Bubblewrap. But these tools are either too high-level (like the Kubernetes CRI), or th
Keywords: container linux namespace namespaces styrolite
Find related items on AmazonPublished on: 2025-06-23 19:03:51
C++/WinRT pull request 1225 fixed a problem with a call to invoke . What’s the problem, why did it show up all of a sudden, and what can you do if you are stuck on an older version of C++/WinRT? The problem is at the point in winrt:: impl:: promise_base ::set_completed makes an unqualified call to invoke() : namespace winrt::impl { ⟦ ... ⟧ template <typename Delegate, typename... Arg> bool invoke(Delegate const& delegate, Arg const&... args) noexcept; ⟦ ... ⟧ template <typename Derived, typena
Keywords: handler invoke namespace std winrt
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