Description
Memory leak in the zlib_stateful_finish function in crypto/comp/c_zlib.c in OpenSSL 0.9.8l and earlier and 1.0.0 Beta through Beta 4 allows remote attackers to cause a denial of service (memory consumption) via vectors that trigger incorrect calls to the CRYPTO_cleanup_all_ex_data function, as demonstrated by use of SSLv3 and PHP with the Apache HTTP Server, a related issue to CVE-2008-1678.
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 | openssl | 0.9.8k-8 | — |
| Debian 13 | openssl | 0.9.8k-8 | — |
| Debian 12 | openssl | 0.9.8k-8 | — |
| Debian 5.0 | openssl | 0.9.8g-15+lenny6 | DSA-1970-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | openssl +2 | 0.9.8e-12.el5_4.1 | RHSA-2010:0054 |
Advisories 2
- RHSA-2010:0054 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-1970-1 openssl - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-1970 vendor-advisory
- ADV-2010-0916 vdb-entry
- http://cvs.openssl.org/chngview?cn=19167
- 42724 third-party-advisory
- 39461 third-party-advisory
- oval:org.mitre.oval:def:11260 vdb-entry signature
- https://bugzilla.redhat.com/show_bug.cgi?id=546707
- FEDORA-2010-5357 vendor-advisory
- SSA:2010-060-02 vendor-advisory
- 38761 third-party-advisory
- http://wiki.rpath.com/wiki/Advisories:rPSA-2010-0004
- 38181 third-party-advisory
- 38200 third-party-advisory
- https://issues.rpath.com/browse/RPL-3157
- ADV-2010-0839 vdb-entry
- http://cvs.openssl.org/chngview?cn=19069
- HPSBUX02517 vendor-advisory
- http://cvs.openssl.org/chngview?cn=19068
- MDVSA-2010:022 vendor-advisory
- RHSA-2010:0095 vendor-advisory
- USN-884-1 vendor-advisory
- SUSE-SA:2010:008 vendor-advisory
- [oss-security] 20100113 [PATCH] memory consumption (DoS) in openssl CVE-2009-4355 mailing-list
- https://kb.bluecoat.com/index?page=content&id=SA50
- oval:org.mitre.oval:def:6678 vdb-entry signature
- 42733 third-party-advisory
- ADV-2010-0124 vdb-entry
- FEDORA-2010-5744 vendor-advisory
- 38175 third-party-advisory
- oval:org.mitre.oval:def:12168 vdb-entry signature