Multiple Linux Vendor restore Buffer Overflow Vulnerability

A buffer overflow exists in the 'restore' program, part of the dump 0.4b15-1 package, distributed with RedHat Linux 6.2. By supplying a long string containing machine executable code at the prompt for a tape name, it is possible for an attacker to execute arbitrary code with root privileges.

The buffer overflow lies in the tape.c source file:
/dump-0.4b15/compat/include/protocols/dumprestore.h: line 53: #define TP_BSIZE 1024
/dump-0.4b15/restore/tape.c: line 311: char buf[TP_BSIZE];
/dump-0.4b15/restore/tape.c: line 357: (void) fgets(buf, BUFSIZ, terminal)
/dump-0.4b15/restore/tape.c: line 382: (void) fgets(buf, BUFSIZ, terminal);

As BUFSIZ is defined to be 8192, the fgets() will attempt to copy up to 8192 bytes in to a 1024 byte buffer.


 

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