K19473898 : Expat vulnerabilities CVE-2022-23852, CVE-2022-25235, CVE-2022-25236, and CVE-2022-25315

Security Advisory Description

• CVE-2022-23852

Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.

• CVE-2022-25235

xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.

• CVE-2022-25236

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

• CVE-2022-25315

In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.

Impact

A remote attacker could send specially crafted XML which, when parsed by an application using the Expat library, would result in a buffer over-read and cause the application to stop responding.