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28 lines
1.2 KiB
Markdown
28 lines
1.2 KiB
Markdown
```toml
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[advisory]
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id = "RUSTSEC-2021-0003"
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package = "smallvec"
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aliases = ["CVE-2021-25900"]
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date = "2021-01-08"
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url = "https://github.com/servo/rust-smallvec/issues/252"
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categories = ["memory-corruption"]
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keywords = ["buffer-overflow", "heap-overflow", "unsound"]
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[versions]
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patched = [">= 0.6.14, < 1.0.0", ">= 1.6.1"]
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unaffected = ["< 0.6.3"]
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[affected]
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functions = { "smallvec::SmallVec::insert_many" = [">= 0.6.3, < 0.6.14", ">= 1.0.0, < 1.6.1"] }
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```
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# Buffer overflow in SmallVec::insert_many
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A bug in the `SmallVec::insert_many` method caused it to allocate a buffer that was smaller than needed. It then wrote past the end of the buffer, causing a buffer overflow and memory corruption on the heap.
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This bug was only triggered if the iterator passed to `insert_many` yielded more items than the lower bound returned from its `size_hint` method.
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The flaw was corrected in smallvec 0.6.14 and 1.6.1, by ensuring that additional space is always reserved for each item inserted. The fix also simplified the implementation of `insert_many` to use less unsafe code, so it is easier to verify its correctness.
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Thank you to Yechan Bae (@Qwaz) and the Rust group at Georgia Tech’s SSLab for finding and reporting this bug.
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