SB2022082220 - Denial of service in Exim
Published: August 22, 2022
Security Bulletin ID
SB2022082220
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Release of invalid pointer or reference (CVE-ID: CVE-2022-37451)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an invalid free in pam_converse() function in auths/call_pam.c. A remote attacker can initiate the connection to the affected mail server and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://www.exim.org/static/doc/security/
- https://github.com/ivd38/exim_invalid_free
- https://github.com/Exim/exim/compare/exim-4.95...exim-4.96
- https://lists.exim.org/lurker/message/20220625.141825.d6de6074.en.html
- https://www.openwall.com/lists/oss-security/2022/08/06/1
- https://github.com/Exim/exim/wiki/EximSecurity
- https://cwe.mitre.org/data/definitions/762.html
- https://github.com/Exim/exim/commit/51be321b27825c01829dffd90f11bfff256f7e42