Vulnerability identifier: #VU49670

Vulnerability risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-29562

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

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

Vendor: GNU

Description

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

The vulnerability exists due to a reachable assertion when converting UCS4 text containing an irreversible character in the iconv function in the GNU C Library (aka glibc or libc6). A remote attacker can pass specially crafted data to the library, trigger an assertion failure and preform a denial of service attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Glibc: 2.30, 2.30.9000, 2.31, 2.31.9000, 2.32, 2.32.9000

CPE

• cpe:2.3:a:gnu:glibc:2.32.9000:*:*:*:*::*:*
• cpe:2.3:a:gnu:glibc:2.32:*:*:*:*::*:*
• cpe:2.3:a:gnu:glibc:2.31.9000:*:*:*:*::*:*
• cpe:2.3:a:gnu:glibc:2.30.9000:*:*:*:*::*:*
• cpe:2.3:a:gnu:glibc:2.31:*:*:*:*::*:*
• cpe:2.3:a:gnu:glibc:2.30:*:*:*:*::*:*

External links
https://sourceware.org/bugzilla/show_bug.cgi?id=26923

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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.