#VU17885 Input validation error in Glibc - CVE-2009-5155

Vulnerability identifier: #VU17885

Vulnerability risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2009-5155

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

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

Vendor: GNU

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input passed to parse_reg_exp() function in posix/regcomp.c . A local user can send specially crafted input to application that uses the affected version of glibc and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Glibc: 1.00 - 2.27

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External links
https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
https://sourceware.org/bugzilla/show_bug.cgi?id=11053
https://sourceware.org/bugzilla/show_bug.cgi?id=18986
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eb04c21373e2a2885f3d52ff192b0499afe3c672

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.