SB2019112632 - Multiple vulnerabilities in Python typed_ast

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2019-19274)

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

typed_ast 1.3.0 and 1.3.1 has a handle_keywordonly_args out-of-bounds read. An attacker with the ability to cause a Python interpreter to parse Python source (but not necessarily execute it) may be able to crash the interpreter process. This could be a concern, for example, in a web-based service that parses (but does not execute) Python code. (This issue also affected certain Python 3.8.0-alpha prereleases.)

2) Out-of-bounds read (CVE-ID: CVE-2019-19275)

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments out-of-bounds read. An attacker with the ability to cause a Python interpreter to parse Python source (but not necessarily execute it) may be able to crash the interpreter process. This could be a concern, for example, in a web-based service that parses (but does not execute) Python code. (This issue also affected certain Python 3.8.0-alpha prereleases.)

Remediation

Install update from vendor's website.

References

• https://bugs.python.org/issue36495
• https://github.com/python/cpython/commit/a4d78362397fc3bced6ea80fbc7b5f4827aec55e
• https://github.com/python/cpython/commit/dcfcd146f8e6fc5c2fc16a4c192a0c5f5ca8c53c
• https://github.com/python/typed_ast/commit/156afcb26c198e162504a57caddfe0acd9ed7dce
• https://github.com/python/typed_ast/commit/dc317ac9cff859aa84eeabe03fb5004982545b3b
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LG5H4Q6LFVRX7SFXLBEJMNQFI4T5SCEA/