31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
[CVE-2012-0804] Fix proxy response parser
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If proxy sends overlong HTTP vesion string, the string will be copied
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to unallocatd space (write_buf) causing heap overflow.
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This patch fixes it by ignoring the HTTP version string and checking
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the response line has been parsed correctly.
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See <https://bugzilla.redhat.com/show_bug.cgi?id=773699> for more
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details.
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Index: src/client.c
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===================================================================
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RCS file: /sources/cvs/ccvs/src/client.c,v
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retrieving revision 1.483
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diff -u -r1.483 client.c
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--- a/src/client.c 18 Nov 2008 22:59:02 -0000 1.483
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+++ b/src/client.c 26 Jan 2012 16:32:25 -0000
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@@ -4339,9 +4339,9 @@
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* code.
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*/
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read_line_via (from_server, to_server, &read_buf);
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- sscanf (read_buf, "%s %d", write_buf, &codenum);
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+ count = sscanf (read_buf, "%*s %d", &codenum);
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- if ((codenum / 100) != 2)
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+ if (count != 1 || (codenum / 100) != 2)
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error (1, 0, "proxy server %s:%d does not support http tunnelling",
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root->proxy_hostname, proxy_port_number);
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free (read_buf);
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