Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | exim4 | 4.95-4 | — |
| Debian 13 | exim4 | 4.95-4 | — |
| Debian 12 | exim4 | 4.95-4 | — |
Advisories 1
- WID-SEC-2022-0934 Exim: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jun 6, 2023
References
- https://github.com/Exim/exim/wiki/EximSecurity
- https://www.exim.org/static/doc/security/
- https://github.com/ivd38/exim_invalid_free
- https://www.openwall.com/lists/oss-security/2022/08/06/1
- https://lists.exim.org/lurker/message/20220625.141825.d6de6074.en.html
- https://cwe.mitre.org/data/definitions/762.html
- https://github.com/Exim/exim/compare/exim-4.95...exim-4.96
- https://github.com/Exim/exim/commit/51be321b27825c01829dffd90f11bfff256f7e42
- FEDORA-2022-1ca1d22165 vendor-advisory
- FEDORA-2022-f9a8388e62 vendor-advisory