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31 lines
871 B
31 lines
871 B
8 months ago
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commit 77b3fb4df0f126784d5fd4967c28ed40eb8d521b
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Author: Alex Rousskov <rousskov@measurement-factory.com>
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Date: Wed Oct 25 19:41:45 2023 +0000
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RFC 1123: Fix date parsing (#1538)
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The bug was discovered and detailed by Joshua Rogers at
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https://megamansec.github.io/Squid-Security-Audit/datetime-overflow.html
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where it was filed as "1-Byte Buffer OverRead in RFC 1123 date/time
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Handling".
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diff --git a/lib/rfc1123.c b/lib/rfc1123.c
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index e5bf9a4d7..cb484cc00 100644
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--- a/lib/rfc1123.c
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+++ b/lib/rfc1123.c
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@@ -50,7 +50,13 @@ make_month(const char *s)
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char month[3];
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month[0] = xtoupper(*s);
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+ if (!month[0])
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+ return -1; // protects *(s + 1) below
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+
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month[1] = xtolower(*(s + 1));
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+ if (!month[1])
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+ return -1; // protects *(s + 2) below
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+
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month[2] = xtolower(*(s + 2));
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for (i = 0; i < 12; i++)
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