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22 lines
1.1 KiB
Markdown
22 lines
1.1 KiB
Markdown
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# Release 1.11.10 (2017-06-12)
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This release fixes a security bug in Nix’s “build user” build isolation
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mechanism. Previously, Nix builders had the ability to create setuid
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binaries owned by a `nixbld` user. Such a binary could then be used by
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an attacker to assume a `nixbld` identity and interfere with subsequent
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builds running under the same UID.
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To prevent this issue, Nix now disallows builders to create setuid and
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setgid binaries. On Linux, this is done using a seccomp BPF filter. Note
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that this imposes a small performance penalty (e.g. 1% when building GNU
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Hello). Using seccomp, we now also prevent the creation of extended
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attributes and POSIX ACLs since these cannot be represented in the NAR
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format and (in the case of POSIX ACLs) allow bypassing regular Nix store
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permissions. On macOS, the restriction is implemented using the existing
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sandbox mechanism, which now uses a minimal “allow all except the
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creation of setuid/setgid binaries” profile when regular sandboxing is
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disabled. On other platforms, the “build user” mechanism is now
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disabled.
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Thanks go to Linus Heckemann for discovering and reporting this bug.
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