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Vigil@nce - glibc: buffer overflow via strcoll

September 2012 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

When an attacker can create strings which are transmitted to the strcoll() function, he can generate an overflow, in order to create a denial of service in the application linked to the glibc, or to execute code.

Impacted products: Unix (platform)

Severity: 2/4

Creation date: 10/09/2012

DESCRIPTION OF THE VULNERABILITY

The strcoll() function of the glibc compares two strings using the current locale: int strcoll( const char * str1, const char * str2 );

This function allocates a memory area to store strings. However, on a 32 bit processor, if the total size of strings is greater than 800Mo, an integer overflow occurs, and data coming from the strings corrupt the memory.

When an attacker can create strings which are transmitted to the strcoll() function, he can therefore generate an overflow, in order to create a denial of service in the application linked to the glibc, or to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/g...




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