جزئیات آسیب‌پذیری

Issue summary: An uncommon configuration of clients performing DANE TLSA-based server authentication, when paired with uncommon server DANE TLSA records, may result in a use-after-free and/or double-free on the client side. Impact summary: A use after free can have a range of potential consequences such as the corruption of valid data, crashes or execution of arbitrary code. However, the issue only affects clients that make use of TLSA records with both the PKIX-TA(0/PKIX-EE(1) certificate usages and the DANE-TA(2) certificate usage. By far the most common deployment of DANE is in SMTP MTAs for which RFC7672 recommends that clients treat as 'unusable' any TLSA records that have the PKIX certificate usages. These SMTP (or other similar) clients are not vulnerable to this issue. Conversely, any clients that support only the PKIX usages, and ignore the DANE-TA(2) usage are also not vulnerable. The client would also need to be communicating with a server that publishes a TLSA RRset with both types of TLSA records. No FIPS modules are affected by this issue, the problem code is outside the FIPS module boundary.

• https://openssl-library.org/news/secadv/20260407.txt vendor-advisory
• https://github.com/openssl/openssl/commit/258a8f63b26995ba357f4326da00e19e29c6acbe patch
• https://github.com/openssl/openssl/commit/444958deaf450aea819171f97ae69eaedede42c3 patch
• https://github.com/openssl/openssl/commit/07e727d304746edb49a98ee8f6ab00256e1f012b patch
• https://github.com/openssl/openssl/commit/7a4e08cee62a728d32e60b0de89e6764339df0a7 patch
• https://github.com/openssl/openssl/commit/ec03fa050b3346997ed9c5fef3d0e16ad7db8177 patch
• https://cert-portal.siemens.com/productcert/html/ssa-265688.html
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html