Exim up to 4.95 auths/call_pam.c pam_converse use after free

Summaryinfo

A vulnerability marked as problematic has been reported in Exim up to 4.95. This issue affects the function pam_converse of the file auths/call_pam.c. This manipulation causes use after free. This vulnerability is registered as CVE-2022-37451. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Exim up to 4.95 (Mail Server Software) and classified as problematic. Affected by this vulnerability is the function pam_converse of the file auths/call_pam.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Exim before 4.96 has an invalid free in pam_converse in auths/call_pam.c because store_free is not used after store_malloc.

The weakness was published 08/07/2022. The advisory is shared at lists.exim.org. This vulnerability is known as CVE-2022-37451 since 08/06/2022. Technical details are known, but no exploit is available.

Upgrading to version 4.96 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 51be321b27825c01829dffd90f11bfff256f7e42 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Mail Server Software

Name

• Exim

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17
• 4.18
• 4.19
• 4.20
• 4.21
• 4.22
• 4.23
• 4.24
• 4.25
• 4.26
• 4.27
• 4.28
• 4.29
• 4.30
• 4.31
• 4.32
• 4.33
• 4.34
• 4.35
• 4.36
• 4.37
• 4.38
• 4.39
• 4.40
• 4.41
• 4.42
• 4.43
• 4.44
• 4.45
• 4.46
• 4.47
• 4.48
• 4.49
• 4.50
• 4.51
• 4.52
• 4.53
• 4.54
• 4.55
• 4.56
• 4.57
• 4.58
• 4.59
• 4.60
• 4.61
• 4.62
• 4.63
• 4.64
• 4.65
• 4.66
• 4.67
• 4.68
• 4.69
• 4.70
• 4.71
• 4.72
• 4.73
• 4.74
• 4.75
• 4.76
• 4.77
• 4.78
• 4.79
• 4.80
• 4.81
• 4.82
• 4.83
• 4.84
• 4.85
• 4.86
• 4.87
• 4.88
• 4.89
• 4.90
• 4.91
• 4.92
• 4.93
• 4.94
• 4.95

License

• open-source

Website

• Product: https://github.com/Exim/exim/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion