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>> QEMU Data Handling Multiple Command Execution and Denial of Service Vulnerabilities
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Multiple vulnerabilities have been identified in QEMU, which could be exploited by remote attackers to cause a denial of service or execute arbitrary code.
The first issue is caused by a heap overflow error in the "cirrus_invalidate_region()" within the Cirrus video driver, which could be exploited by attackers to execute arbitrary commands.
The second vulnerability is caused by heap overflow and integer signedness errors in the NE2000 network driver, which could be exploited by attackers to bypass security checks and execute arbitrary code.
The third issue is caused by an infinite loop in the emulated SB16 device, which could be exploited to cause a denial of service.
The fourth issue is caused by an error in the DMA code that dereferences an uninitialized function pointer when handling commands sent to an unregistered dma, which could be exploited to cause a denial of service.
The fifth vulnerability is caused by a divide-by-zero in an unprivileged "aam" instruction when handling the undocumented divisor operand channel, which could be exploited to crash an affected application.
The sixth issue is caused by an error in the "icebp" instruction, which could be exploited to halt the virtual machine, creating a denial of service condition.
The seventh vulnerability is caused by insufficient block device address range checking, which could be exploited to bypas ssecurity restrictions or crash an affected application.
Multiple errors within the BIOS and the emulated IDE controller could be exploited to cause a denial of service or bypass security checks.
Affected Products
QEMU versions 0.x
Solution
VUPEN Security is not aware of any vendor-supplied patch.
References
http://www.vupen.com/english/advisories/2007/1597
http://taviso.decsystem.org/virtsec.pdf
Credits
Vulnerabilities reported by Tavis Ormandy (Google) and Ian Jackson.
ChangeLog
2007-05-01 : Initial release
Vulnerability Management
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