Bug 1937740 (CVE-2020-15260) - CVE-2020-15260 pjproject: existing TLS connections can be reused without checking remote hostname
Summary: CVE-2020-15260 pjproject: existing TLS connections can be reused without chec...
Alias: CVE-2020-15260
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1937742 1937741
TreeView+ depends on / blocked
Reported: 2021-03-11 13:24 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-03-11 17:25 UTC (History)
1 user (show)

Fixed In Version:
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Last Closed: 2021-03-11 17:25:46 UTC

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Description Guilherme de Almeida Suckevicz 2021-03-11 13:24:07 UTC
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In version 2.10 and earlier, PJSIP transport can be reused if they have the same IP address + port + protocol. However, this is insufficient for secure transport since it lacks remote hostname authentication. Suppose we have created a TLS connection to `sip.foo.com`, which has an IP address ``. If we want to create a TLS connection to another hostname, say `sip.bar.com`, which has the same IP address, then it will reuse that existing connection, even though `` does not have certificate to authenticate as `sip.bar.com`. The vulnerability allows for an insecure interaction without user awareness. It affects users who need access to connections to different destinations that translate to the same address, and allows man-in-the-middle attack if attacker can route a connection to another destination such as in the case of DNS spoofing.


Upstream patch:

Comment 1 Guilherme de Almeida Suckevicz 2021-03-11 13:24:35 UTC
Created pjproject tracking bugs for this issue:

Affects: epel-all [bug 1937742]
Affects: fedora-all [bug 1937741]

Comment 2 Product Security DevOps Team 2021-03-11 17:25:46 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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