libarchive: use-after-free (CVE-2019-18408)

archive_read_format_rar_read_data in archive_read_support_format_rar.c in libarchive before 3.4.0 has a use-after-free in a certain ARCHIVE_FAILED situation, related to Ppmd7_DecodeSymbol.

References:

https://nvd.nist.gov/vuln/detail/CVE-2019-18408

Patch:

https://github.com/libarchive/libarchive/commit/b8592ecba2f9e451e1f5cb7ab6dcee8b8e7b3f60

Affected branches:

• master (6787a7e2)
• 3.10-stable
• 3.9-stable
• 3.8-stable
• 3.7-stable