Denial of service in glibc

Published: 2019-01-18 | Updated: 2019-03-01

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-6488 CVE-2009-5155
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Glibc Universal components / Libraries / Libraries used by multiple products
Vendor	GNU

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

UPDATED: 01.03.2019

Added vulnerability #2.

1) Input validation error

EUVDB-ID: #VU17106

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-6488

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy due to application that runs on the x32 architecture incorrectly attempts to use a 64-bit register for size_t in assembly codes. A remote attacker can pass specially crafted data to the application using an affected library and cause segmentation fault.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Glibc: 1.00 - 2.28

External links

http://sourceware.org/bugzilla/show_bug.cgi?id=24097

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.

2) Input validation error

EUVDB-ID: #VU17885

Risk: Low

CVSSv3.1: 5.4 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2009-5155

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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.