Out-of-bounds write in cyrus-sasl (Alpine package)



Published: 2019-12-24 | Updated: 2022-02-08
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-19906
CWE-ID CWE-787
Exploitation vector Network
Public exploit N/A
Vulnerable software
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cyrus-sasl (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Out-of-bounds write

EUVDB-ID: #VU23796

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-2019-19906

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to an out-of-bounds write error when processing LDAP queries within the _sasl_add_string() function in common.c file in cyrus-sasl. A remote non-authenticated attacker can create a specially LDAP request to the affected server, trigger off-by-one error in OpenLDAP implementation and crash the service.

Mitigation

Install update from vendor's website.

Vulnerable software versions

cyrus-sasl (Alpine package): 2.1.26-r14

External links

http://git.alpinelinux.org/aports/commit/?id=0595a8cfd177012e492000c76033a8a089b51270
http://git.alpinelinux.org/aports/commit/?id=320e9fe25de21594bb1ef20b31586ec775ab1758
http://git.alpinelinux.org/aports/commit/?id=336ed678178032d07a97fee172237315410e8d3c
http://git.alpinelinux.org/aports/commit/?id=ae0d0538a6d887aa919e257b5d2e386000418efa
http://git.alpinelinux.org/aports/commit/?id=e20d740be6dacfa112b97d79489bcf960eb2c7f8


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.



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