52 lines
1.6 KiB
Diff
52 lines
1.6 KiB
Diff
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Copied from Fedora.
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http://pkgs.fedoraproject.org/cgit/rpms/krb5.git/tree/krb5-CVE-2015-8629.patch?h=f22
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From df17a1224a3406f57477bcd372c61e04c0e5a5bb Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Fri, 8 Jan 2016 12:45:25 -0500
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Subject: [PATCH 1/3] Verify decoded kadmin C strings [CVE-2015-8629]
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In xdr_nullstring(), check that the decoded string is terminated with
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a zero byte and does not contain any internal zero bytes.
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CVE-2015-8629:
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In all versions of MIT krb5, an authenticated attacker can cause
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kadmind to read beyond the end of allocated memory by sending a string
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without a terminating zero byte. Information leakage may be possible
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for an attacker with permission to modify the database.
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CVSSv2 Vector: AV:N/AC:H/Au:S/C:P/I:N/A:N/E:POC/RL:OF/RC:C
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ticket: 8341 (new)
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target_version: 1.14-next
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target_version: 1.13-next
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tags: pullup
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---
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src/lib/kadm5/kadm_rpc_xdr.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/src/lib/kadm5/kadm_rpc_xdr.c b/src/lib/kadm5/kadm_rpc_xdr.c
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index 2bef858..ba67084 100644
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--- a/src/lib/kadm5/kadm_rpc_xdr.c
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+++ b/src/lib/kadm5/kadm_rpc_xdr.c
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@@ -64,7 +64,14 @@ bool_t xdr_nullstring(XDR *xdrs, char **objp)
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return FALSE;
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}
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}
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- return (xdr_opaque(xdrs, *objp, size));
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+ if (!xdr_opaque(xdrs, *objp, size))
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+ return FALSE;
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+ /* Check that the unmarshalled bytes are a C string. */
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+ if ((*objp)[size - 1] != '\0')
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+ return FALSE;
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+ if (memchr(*objp, '\0', size - 1) != NULL)
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+ return FALSE;
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+ return TRUE;
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case XDR_ENCODE:
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if (size != 0)
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--
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2.7.0.rc3
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