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Apache Tapestry 5.3.6 HMAC Timing Attack

Apache Tapestry 5.3.6 HMAC Timing Attack
Posted Aug 26, 2019
Authored by David Tomaschik

Apache Tapestry version 5.3.6 suffers from a timing attack vulnerability during HMAC verification.

tags | advisory
advisories | CVE-2019-10071
SHA-256 | 2b8427db67e3d329acc8cb4dfc1895672828a371a3235ea047dedb0c4abe8079

Apache Tapestry 5.3.6 HMAC Timing Attack

Change Mirror Download
CVE-2019-10071: Timing Attack in HMAC Verification in Apache Tapestry

Affected versions:
- Apache Tapestry 5.3.6 through current releases.

Description:
Apache Tapestry uses HMACs to verify the integrity of objects stored on the
client side. This was added to address the Java deserialization
vulnerability
disclosed in CVE-2014-1972. In the fix for the previous vulnerability, the
HMACs were compared by string comparison, which is known to be vulnerable to
timing attacks.

Mitigation:
No new release of Tapestry has occurred since the issue was reported.
Affected
organizations may want to consider locally applying commit
d3928ad44714b949d247af2652c84dae3c27e1b1.

Timeline:
- 2019-03-12: Issue discovered.
- 2019-03-13: Issue reported to security@apache.org.
- 2019-03-29: Pinged thread to ask for update.
- 2019-04-19: Fix committed.
- 2019-04-23: Asked about release timeline, response "in the upcoming
months"
- 2019-05-28: Pinging again about release.
- 2019-06-24: Asked again, asked for CVE number assigned. No update on
timeline.
- 2019-08-22: Disclosure posted.

This vulnerability was discovered by David Tomaschik of the Google Security
Team.

--
David Tomaschik
Security Engineer
ISA Assessments


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