Description
digestmd5.c in the CMU Cyrus Simple Authentication and Security Layer (SASL) library 2.1.18, and possibly other versions before 2.1.21, allows remote unauthenticated attackers to cause a denial of service (segmentation fault) via malformed inputs in DIGEST-MD5 negotiation.
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 | cyrus-sasl2 | 2.1.19.dfsg1-0.2 | — |
| Debian 13 | cyrus-sasl2 | 2.1.19.dfsg1-0.2 | — |
| Debian 12 | cyrus-sasl2 | 2.1.19.dfsg1-0.2 | — |
| Debian 3.1 | cyrus-sasl2 | 2.1.19-1.5sarge1 | DSA-1042-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | cyrus-sasl +6 | 2.1.19-14 | RHSA-2007:0795 |
| RHEL 3 | cyrus-sasl +4 | 2.1.15-15 | RHSA-2007:0878 |
Advisories 3
- RHSA-2007:0878 Red Hat Security Advisory: cyrus-sasl security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2007:0795 Red Hat Security Advisory: cyrus-sasl security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1042-1 cyrus-sasl2 - programming error Debian Security (DSA / DLA) · Mar 9, 2026
References
- 26708 third-party-advisory
- ADV-2008-1744 vdb-entry
- 19825 third-party-advisory
- http://asg.web.cmu.edu/archive/message.php?mailbox=archive.cyrus-sasl&msg=7775
- 19809 third-party-advisory
- 19618 third-party-advisory
- 19753 third-party-advisory
- oval:org.mitre.oval:def:9861 vdb-entry signature
- cyrus-sasl-digest-dos(25738) vdb-entry
- http://support.avaya.com/elmodocs2/security/ASA-2007-426.htm
- http://labs.musecurity.com/advisories/MU-200604-01.txt
- 26857 third-party-advisory
- http://www.vmware.com/security/advisories/VMSA-2008-0009.html
- 20060410 [MU-200604-01] Cyrus SASL DIGEST-MD5 Pre-Authentication Denial of Service mailing-list
- 22187 third-party-advisory
- MDKSA-2006:073 vendor-advisory
- ADV-2006-3852 vdb-entry
- 27237 third-party-advisory
- RHSA-2007:0878 vendor-advisory
- RHSA-2007:0795 vendor-advisory
- 20014 third-party-advisory
- APPLE-SA-2006-09-29 vendor-advisory
- 30535 third-party-advisory
- 17446 vdb-entry
- 19964 third-party-advisory
- 20080604 VMSA-2008-0009 Updates to VMware Workstation, VMware Player, VMware ACE, VMware Fusion, VMware Server, VMware VIX API, VMware ESX, VMware ESXi resolve critical security issues mailing-list
- 2006-0024 vendor-advisory
- USN-272-1 vendor-advisory
- SUSE-SA:2006:025 vendor-advisory
- 1016960 vdb-entry
- GLSA-200604-09 vendor-advisory
- ADV-2006-1306 vdb-entry
- DSA-1042 vendor-advisory