NULL Pointer Dereference Affecting openssl-src package, versions <1.1.1k
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-RUST-OPENSSLSRC-1278994
- published3 May 2021
- disclosed1 May 2021
- creditUnknown
Introduced: 1 May 2021
CVE-2021-3449 (opens in a new tab)How to fix?
Upgrade openssl-src to version 1.1.1k or higher.
Overview
openssl-src is a crate that contains the logic to build OpenSSL and is intended to be consumed by the openssl-sys crate.
Affected versions of this package are vulnerable to NULL Pointer Dereference. An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue.