Ubuntu has issued an update for glibc and eglibc. This fixes some weaknesses and vulnerabilities, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges and by malicious people to potentially compromise a vulnerable system.
1) Integer overflows in the libc "strfmon()" function can be exploited to cause a crash or potentially execute arbitrary code via specially crafted format specifiers.
2) The mntent function family does not correctly handle newlines characters. This can be exploited to e.g. cause a DoS or gain escalated privileges, but requires that an attacker can inject newline characters into a mount entry (e.g. via vulnerable mount helpers).
3) A signedness error when processing certain ELF headers can be exploited to e.g. execute arbitrary code via a specially crafted ELF file.
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Subject: Ubuntu update for glibc and eglibc
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