Bug 166330
| Summary: | CAN-2005-2491 PCRE heap overflow | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Mark J. Cox <mjc> | ||||
| Component: | pcre | Assignee: | Than Ngo <than> | ||||
| Status: | CLOSED ERRATA | QA Contact: | Ben Levenson <benl> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 4.0 | CC: | tao | ||||
| Target Milestone: | --- | Keywords: | Security | ||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | RHSA-2005-761 | Doc Type: | Bug Fix | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2005-09-08 17:18:21 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 430638 | ||||||
| Attachments: |
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Created attachment 117907 [details]
Upstream patch from 6.1 to 6.2 to correct this issue
It's hard to assign a severity level to a library such as PCRE as it will depend exactly on how applications use it. Applications that parse untrusted regular expressions are not particularly likely, therefore setting this to Moderate. [vulnerable doesn't actually mean this has a security context, we need to look
how pcre is used in each case]
pcre
(rhel4, rhel3, rhel2.1, fc3, fc4)
exim (rhel4, fc3)
VULNERABLE: confirmed contains pcre in rhel4, seems to
use internal version
gnumeric (fc3)
VULNERABLE: contains pcre, and uses it
httpd (rhel4, rhel3, fc3, fc4)
SAFE: contains pcre, but uses system pcre
nmap (rhel4, fc3, fc4)
SAFE: contains pcre, uses system pcre in rhel4
privoxy (fc3, fc4)
VULNERABLE: contains pcre, uses internal pcre
postfix (rhel3, fc3, fc4)
SAFE: contains pcre, but uses system pcre
php (rhel4, rhel3, rhel2.1, fc3, fc4)
SAFE: contains pcre, but uses system pcre in rhel4, rhel3
UNKNOWN: uses internal pcre in rhel2.1?
Python (rhel4, rhel3, rhel2.1, fc3)
UNKNOWN: Needs investigation
it's now fixed in pcre-3.4-2.1 (RHEL-2.1), pcre-3.9-10.2 (RHEL-3.0E), pcre-4.5-3.2.RHEL4 (RHEL-4), pcre-4.5-3.1.1.fc3 and pcre-5.0-4.1.fc4 An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-761.html |
PCRE 6.2 was released recently which included a fix for a heap buffer overflow. PCRE is used by things such as Apache but only for configuration (therefore making an exploit low severity). A number of packages also include PCRE code internally, I'll be adding separate bugs for those that contain PCRE and do not use system PCRE later. Changelog states: 1. There was no test for integer overflow of quantifier values. A construction such as {1111111111111111} would give undefined results. What is worse, if a minimum quantifier for a parenthesized subpattern overflowed and became negative, the calculation of the memory size went wrong. This could have led to memory overwriting. A minimal diff of the flaw is attached, the full 6.2 to 6.1 diff contains other fixes that might be worth incorporating and a test for this flaw.