[Debian] Medium CVE: CVE-2023-28484/CVE-2023-29469: libxml2: multiple CVEs

[Yue Tao]

CVE-2023-28484: https://nvd.nist.gov/vuln/detail/CVE-2023-28484

In libxml2 before 2.10.4, parsing of certain invalid XSD schemas can lead to a NULL pointer dereference and subsequently a segfault. This occurs in xmlSchemaFixupComplexType in xmlschemas.c.

CVE-2023-29469: https://nvd.nist.gov/vuln/detail/CVE-2023-29469

An issue was discovered in libxml2 before 2.10.4. When hashing empty dict strings in a crafted XML document, xmlDictComputeFastKey in dict.c can produce non-deterministic values, leading to various logic and memory errors, such as a double free. This behavior occurs because there is an attempt to use the first byte of an empty string, and any value is possible (not solely the '\0' value).

Base Score: Medium

References:

https://www.debian.org/security/2023/dsa-5391

https://security-tracker.debian.org/tracker/CVE-2023-28484

https://security-tracker.debian.org/tracker/CVE-2023-29469

['libxml2-dev_2.9.10+dfsg-6.7+deb11u3_amd64.deb===>libxml2-dev_2.9.10+dfsg-6.7+deb11u4_amd64.deb', 'libxml2-utils_2.9.10+dfsg-6.7+deb11u3_amd64.deb===>libxml2-utils_2.9.10+dfsg-6.7+deb11u4_amd64.deb', 'libxml2_2.9.10+dfsg-6.7+deb11u3_amd64.deb===>libxml2_2.9.10+dfsg-6.7+deb11u4_amd64.deb']

[Ghada Khalil (gkhalil)]

Fixed by https://review.opendev.org/c/starlingx/tools/+/887351 which merged on July 12.