59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
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From 9504dd4de49938e4cdd56ce6df635b76eaf37e96 Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Tue, 28 Jul 2020 12:58:26 -0400
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Subject: [PATCH] Fix input length checking in SPNEGO DER decoding
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In get_mech_set(), check the length before reading the first byte, and
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decrease the length by the tag byte when reading and verifying the
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sequence length.
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In get_req_flags(), check the length before reading the first byte,
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and check the context tag length after decoding it.
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ticket: 8933 (new)
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tags: pullup
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target_version: 1.18-next
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target_version: 1.17-next
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(cherry picked from commit 64f4b75a22212681ca293f8f09ddd24b0244d5b4)
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---
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src/lib/gssapi/spnego/spnego_mech.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/src/lib/gssapi/spnego/spnego_mech.c b/src/lib/gssapi/spnego/spnego_mech.c
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index 4cf011143..13c351620 100644
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--- a/src/lib/gssapi/spnego/spnego_mech.c
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+++ b/src/lib/gssapi/spnego/spnego_mech.c
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@@ -3462,14 +3462,14 @@ get_mech_set(OM_uint32 *minor_status, unsigned char **buff_in,
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unsigned char *start;
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int i;
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- if (**buff_in != SEQUENCE_OF)
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+ if (buff_length < 1 || **buff_in != SEQUENCE_OF)
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return (NULL);
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start = *buff_in;
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(*buff_in)++;
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- length = gssint_get_der_length(buff_in, buff_length, &bytes);
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- if (length < 0 || buff_length - bytes < (unsigned int)length)
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+ length = gssint_get_der_length(buff_in, buff_length - 1, &bytes);
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+ if (length < 0 || buff_length - 1 - bytes < (unsigned int)length)
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return NULL;
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major_status = gss_create_empty_oid_set(minor_status,
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@@ -3549,11 +3549,11 @@ get_req_flags(unsigned char **buff_in, OM_uint32 bodysize,
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{
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unsigned int len;
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- if (**buff_in != (CONTEXT | 0x01))
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+ if (bodysize < 1 || **buff_in != (CONTEXT | 0x01))
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return (0);
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if (g_get_tag_and_length(buff_in, (CONTEXT | 0x01),
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- bodysize, &len) < 0)
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+ bodysize, &len) < 0 || len != 4)
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return GSS_S_DEFECTIVE_TOKEN;
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if (*(*buff_in)++ != BIT_STRING)
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