mirror of
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synced 2026-02-15 22:04:38 +01:00
27 lines
935 B
Markdown
27 lines
935 B
Markdown
```toml
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[advisory]
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id = "RUSTSEC-2021-0055"
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package = "openssl-src"
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aliases = ["CVE-2021-3449", "GHSA-83mx-573x-5rw9"]
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cvss = "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
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categories = ["denial-of-service"]
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date = "2021-05-01"
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url = "https://www.openssl.org/news/secadv/20210325.txt"
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[versions]
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patched = [">= 111.15"]
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```
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# NULL pointer deref in signature_algorithms processing
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An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation
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ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits
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the signature_algorithms extension (where it was present in the initial
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ClientHello), but includes a signature_algorithms_cert extension then a NULL
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pointer dereference will result, leading to a crash and a denial of service
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attack.
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A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which
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is the default configuration). OpenSSL TLS clients are not impacted by this
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issue.
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