[Security] Bump httplib2 from 0.18.1 to 0.19.0

[dependabot-preview[bot]]

Bumps httplib2 from 0.18.1 to 0.19.0. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Regular Expression Denial of Service (REDoS) in httplib2

Impact

A malicious server which responds with long series of \xa0 characters in the www-authenticate header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server.

Patches

Version 0.19.0 contains new implementation of auth headers parsing, using pyparsing library. httplib2/httplib2#182

Workarounds

import httplib2
httplib2.USE_WWW_AUTH_STRICT_PARSING = True

Technical Details

The vulnerable regular expression is https://github.com/httplib2/httplib2/blob/595e248d0958c00e83cb28f136a2a54772772b50/python3/httplib2/__init__.py#L336-L338

The section before the equals sign contains multiple overlapping groups. Ignoring the optional part containing a comma, we have:

\s*[^ \t\r\n=]+\s*=

... (truncated)

Affected versions: < 0.19.0

Changelog

Sourced from httplib2's changelog.

0.19.0

auth: parse headers using pyparsing instead of regexp httplib2/httplib2#182

auth: WSSE token needs to be string not bytes httplib2/httplib2#179

Commits

• 81e80d0 v0.19.0 release
• c3aed1e fix release script, interactive part
• bd9ee25 parse auth headers using pyparsing instead of regexp
• 33090ab initial fuzz testing integration with OSS-Fuzz
• 595e248 auth: WSSE token needs to be string not bytes
• See full diff in compare view

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