v6 Next Backports #1544
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v6 Next Backports #1544
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Squid manipulations often increase HTTP header value length compared to
the corresponding raw value received by Squid. Raw header length is
checked against request_header_max_size and reply_header_max_size that
default to 64KB, making the raw value safe to store in a String object
(by default). However, when the increased length of a manipulated value
exceeds String class limits, Squid leaks memory, asserts, or possibly
stalls affected transactions. The long-term fix for this problem is a
complete String elimination from Squid sources, but that takes time.
Known manipulations may effectively concatenate headers and/or increase
header value length by 50%. This workaround makes such known increases
safe by essentially tripling String class limits:
(64KB + 64KB) * 150% = 3 * 64KB
This bug was discovered and detailed by Joshua Rogers at
https://megamansec.github.io/Squid-Security-Audit/response-memleaks.html
where it was filed as "Memory Leak in HTTP Response Parsing".
yadij
approved these changes
Oct 26, 2023
kinkie
approved these changes
Oct 26, 2023
The bug was discovered and detailed by Joshua Rogers at https://megamansec.github.io/Squid-Security-Audit/datetime-overflow.html where it was filed as "1-Byte Buffer OverRead in RFC 1123 date/time Handling".
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