NULL Pointer Dereference Affecting openssl-src package, versions <1.1.1j
Threat Intelligence
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Start learning- Snyk IDSNYK-RUST-OPENSSLSRC-1278993
- published3 May 2021
- disclosed1 May 2021
- creditTavis Ormandy
Introduced: 1 May 2021
CVE-2021-23841 (opens in a new tab)How to fix?
Upgrade openssl-src to version 1.1.1j 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. The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources.