Title: John Sage ACK_hole01 Potential Remote Heap Buffer Overrun Vulnerability
Severity: MODERATE
Description:
John Sage ACK_hole01 is a TCP/IP network data sink for Unix and Linux platforms.
ACK_hole01 has been reported prone to a remote heap overrun vulnerability. The issue presents itself because the size_t integer variable 'bytes' used to limit data that is read into a heap based buffer, using a read() call, is not properly initialized. As a result of this flaw, the 'bytes' variable will be assigned a value based on random data on the stack. When this variable is later used as the count argument for a read() call, excessive attacker-supplied data may be read from a network socket descriptor into a reserved buffer in the heap.
Because of the nature of this issue, the vulnerability may only present itself if the 'bytes' integer contains a sufficient value, so that data read exceeds the size of the reserved buffer. An attacker may potentially exploit this issue to corrupt inline heap memory management chunk headers that are adjacent to the affected buffer. Exploitation of the issue may be hindered because free() is not called on an affected adjacent chunk; this, however, has not been confirmed, as other heap exploitation vectors may be plausible.
Affected Products:
- John Sage ACK_hole01.c 0.0.2
- John Sage ACK_hole01.c 0.0.3
- John Sage ACK_hole01.c 0.0.4
References:
- John Sage: ACK_hole Homepage
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