Vulnerability identifier: #VU42856

Vulnerability risk: Medium

CVSSv3.1: 6.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2009-5029

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Glibc
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Integer overflow in the __tzfile_read function in glibc before 2.15 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted timezone (TZ) file, as demonstrated using vsftpd.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Glibc: 2.0 - 2.13

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External links
http://dividead.wordpress.com/2009/06/01/glibc-timezone-integer-overflow/
http://lists.grok.org.uk/pipermail/full-disclosure/2011-December/084452.html
http://sourceware.org/git/?p=glibc.git;a=commit;h=97ac2654b2d831acaa18a2b018b0736245903fd2
http://sourceware.org/ml/libc-alpha/2011-12/msg00037.html
http://bugzilla.redhat.com/show_bug.cgi?id=761245

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.