Improper Handling of Exceptional Conditions in busybox (Alpine package)

1) Improper Handling of Exceptional Conditions

EUVDB-ID: #VU51741

Risk: Medium

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-2021-28831

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

Exploit availability: No

Description

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

The vulnerability exists due to improper handling of error bit on the huft_build result pointer in decompress_gunzip.c. A remote attacker can pass malformed gzip data to the application, trigger an invalid free and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

busybox (Alpine package): 1.19.4-r0 - 1.30.1-r4

External links

http://git.alpinelinux.org/aports/commit/?id=0d639f13e315e43a11821d963031ed5b49b15a15
http://git.alpinelinux.org/aports/commit/?id=26527b0535f65a4ac0ae7f3c9afb2294885b21cc
http://git.alpinelinux.org/aports/commit/?id=7332e004b92f2a688a28eee7628a1e6e16d76147
http://git.alpinelinux.org/aports/commit/?id=7acc3190c16c19db5767c094d5ea6de75bbc2ae8
http://git.alpinelinux.org/aports/commit/?id=8457a320f13d202a1c65be2652f0d030880f17f0

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.