Description
Format string vulnerability in the ParseBannerAndCapability function in main.c for up-imapproxy 1.2.3 and 1.2.4 allows remote IMAP servers to execute arbitrary code via format string specifiers in a banner or capability line.
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 | up-imapproxy | 1.2.4-2 | — |
| Debian 13 | up-imapproxy | 1.2.4-2 | — |
| Debian 12 | up-imapproxy | 1.2.4-2 | — |
| Debian 3.1 | up-imapproxy | 1.2.3-1sarge1 | DSA-852-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Up-IMAPProxy 1.2.3/1.2.4 - Multiple Unspecified Remote Format String Vulnerabilities EDB-26340 · dos · Oct 10, 2005 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DSA-852-1 up-imapproxy - arbitrary code execution Debian Security (DSA / DLA) · Mar 9, 2026
References
- 17120 third-party-advisory
- GLSA-200603-04 vendor-advisory
- 15048 vdb-entry
- ADV-2005-2014 vdb-entry
- 547 third-party-advisory
- DSA-852 vendor-advisory
- 17100 third-party-advisory
- ADV-2005-2015 vdb-entry
- 19113 third-party-advisory