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Re: Solaris /usr/bin/cu Vulnerability
From: Konrad Rieck <kr () R0Q CX>
Date: Thu, 18 Jan 2001 23:57:12 +0100

(Dont know about Solaris 8)

I could reproduce the segmentation fault on Solaris 8 x86 and Sparc.
The source of /usr/bin/cu shows that argv[0] is simply strcpy()'ed to
a buffer that is only 15 bytes long. Using strncpy() might be a
solution.

The strange thing is that all other programs that are part of the uucp
package copy a constant program name into the buffer and don't use
argv[0] at all. (bnuconvert, ct, dial, uucheck, uucico, uucleanup, uucp,
uushched, uustat, uux and uuxqt).

Well, maybe people at Sun can explain, why it is necessary to retrieve
the program name from the arguments in case of cu. I am a total uucp
fool and have no clue.

cu is only set setuid for the owner uucp and an attacker won't gain any
special privileges, but he would gain access to the files in /etc/uucp.

Regards,
Konrad

--
Konrad Rieck <kr () r0q cx>
Roqefellaz - http://www.r0q.cx, GPG Public Key http://www.r0q.cx/keys/kr.pub
--           Fingerprint: 3AA8 CF92 C179 9760 C3B3  1B43 33B6 9221 AFBF 5897


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