Title: [2.7] bpo-32981: Fix catastrophic backtracking vulns (GH-5955) by benjaminp · Pull Request #5970 · python/cpython · GitHub
Open Graph Title: [2.7] bpo-32981: Fix catastrophic backtracking vulns (GH-5955) by benjaminp · Pull Request #5970 · python/cpython
X Title: [2.7] bpo-32981: Fix catastrophic backtracking vulns (GH-5955) by benjaminp · Pull Request #5970 · python/cpython
Description: Prevent low-grade poplib REDOS (CVE-2018-1060) The regex to test a mail server's timestamp is susceptible to catastrophic backtracking on long evil responses from the server. Happily, the maximum length of malicious inputs is 2K thanks to a limit introduced in the fix for CVE-2013-1752. A 2KB evil response from the mail server would result in small slowdowns (milliseconds vs. microseconds) accumulated over many apop calls. This is a potential DOS vector via accumulated slowdowns. Replace it with a similar non-vulnerable regex. The new regex is RFC compliant. The old regex was non-compliant in edge cases. Prevent difflib REDOS (CVE-2018-1061) The default regex for IS_LINE_JUNK is susceptible to catastrophic backtracking. This is a potential DOS vector. Replace it with an equivalent non-vulnerable regex. Also introduce unit and REDOS tests for difflib. Co-authored-by: Tim Peters tim.peters@gmail.com Co-authored-by: Christian Heimes christian@python.org. (cherry picked from commit 0e6c8ee) https://bugs.python.org/issue32981
Open Graph Description: Prevent low-grade poplib REDOS (CVE-2018-1060) The regex to test a mail server's timestamp is susceptible to catastrophic backtracking on long evil responses from the server. Happily, the maxi...
X Description: Prevent low-grade poplib REDOS (CVE-2018-1060) The regex to test a mail server's timestamp is susceptible to catastrophic backtracking on long evil responses from the server. Happily, the ...
Opengraph URL: https://github.com/python/cpython/pull/5970
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